Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f963a55dbbf6d3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 06:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bd75f4443b9ec985270e31c98efe6434 SHA-1: d5473ef4587914d5316523764c080e901288e786 SHA-256: e2f963a55dbbf6d374bf4bd2ee408ac6a46dec32094dca5770d44ad570834905
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160982f51d6bf3---luzexodorazonefixib.pdf In PDF document text
    • https://iveducentar.com/uploads/assets/file/juvoli.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/17714008150.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608832f0ca4c6---48731903120.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210804191230.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/vadat.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16117c6d907737---xupem.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/reparuriga.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb079cddf4---97139911589.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ac66409c---16613025381.pdfIn PDF document text
    • http://rcot.by/pics/files/58487951449.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/gufilifulesega.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dce9ceb9---6956667357.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/vinaseje.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/atom2v4rn8pg7fpku3dqs6em68/jaxabibajojebesixafipe.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/53678732578.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/jukuluba.pdfIn PDF document text
    • http://fructusartis.com/i/File/jexili.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/78482273138.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/gogedamatasogetur.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/2e51abca45beb715967593a852572704/74102100627.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/96920808087.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d5108a88---75026569977.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125cd476d2f6---391295945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=idmss+plus+app+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 21016 bytes
SHA-256: 537b526d5f6b5c7bbb355dece0b5803409b107ecc20cb4006515a96122052e67
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 10060 bytes
SHA-256: dcc34a59f4d9a8846a98b77c3ea03f31f3cc1d60478bcaf6a30347c274af285d
font_02_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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