Malicious PDF — malware analysis report

Static analysis result for SHA-256 2361efd7fa2ef0dd…

MALICIOUS

PDF

109.0 KB Created: 2021-06-27 10:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 34b3fe04d4db476505bb7603ec48b809 SHA-1: cec084757affc16de8c61964a1d8cdb28a34c119 SHA-256: 2361efd7fa2ef0ddd2a4d3e016e483014032f8a65e98e781a2290aef45b41da1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a social engineering lure, specifically prompting the user to install a browser extension or update. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document also contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm or distribution point for malicious content. While no scripts were directly extracted, the nature of the lure and the presence of external links indicate a high likelihood of further malicious activity, such as downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 7

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d186c441d5c---rokudor.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a077baba06---34911827333.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/n14v1uuejgkbghq2roklq27n8l/64331723115.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3ddcde5d36f8e60054b8427853550420/66542059506.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bb5ef25fc6c920da13576d5ebd6aca34/jasopumosivi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160add56cb97c5---xuzax.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/39850754623.pdfIn PDF document text
    • http://evola.it/userfiles/files/kigibivoxibarit.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c721e7c6efb741c4dbb188d945506a28/kumotulekodumexis.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942e426bb98---69010207786.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080933883df7---boponapukizoxur.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e909d602---29520648729.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/zubedurukokujebilesutu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nt9huuu8p729u8tgmd1i7u8co2/rugedowotolepe.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-14/20210514132226349319.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/37909423382.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/37891da5295922711f6fd6bce8287d20/sinanagidexifexuzalav.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7782d3bb9---12391948582.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a25914333e7---fedulitumofular.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/df7fm4jrt5i67itjqcjke4pop1/78947481986.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/98f3f58f5cb60a0f42bc277f89ef27b3/jadisofupiwexavakewerix.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb29ae5d64---defef.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab39d0646---37066663732.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8d098140---fepunugo.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/q73fh9h69sc84t2ie10j6l7t1n/4423989245.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160730bceef709---vunezujusojagix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sample+resume+for+1+year+experience+in+manual+testingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 11264 bytes
SHA-256: 92ae2de41b0f325135cd04b4155e2bae3ebb9f4dab2d6f8fc5c16ef22d94f688
font_01_sfnt_off00014460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14460 16952 bytes
SHA-256: 13e01f85d07505a62bc9d1e722c663f1847fc863cc6e7df89c01bac911560f42
font_02_sfnt_off00015c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C59 18668 bytes
SHA-256: de8c5ecc8823ad98205e5cd753756f76aa7078186ad022efba506c135c48634a
font_03_sfnt_off00018d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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