Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cda632c59eac1a8…

MALICIOUS

PDF

85.1 KB Created: 2021-07-21 02:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6418c5021c36e8b0c357ee2c6712f486 SHA-1: 63ec16321387a6ffde116419d65b45e5755d350a SHA-256: 1cda632c59eac1a8859f925b31775809b91053fb5658f3b52290ca6f9320e1a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown PDF links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13f0f0e47---54203202592.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/fezeluj.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1039d78f7a2875cb161b37dccfa30cb7/pemotefepavowodapufoneniw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lqat5ackh3blo8ktj04jasn0l5/67433709787.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/sofukezi.pdfIn PDF document text
    • http://biosite.ru/images/news/file/zimofored.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/bk47e0rh6fae0mact8c7chvu7l/49578176649.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/70344980842.pdfIn PDF document text
    • https://soechi.net/userfiles/file/77797446104.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c3e3ec11f43b079f4521ee0a4f5d2eab/raselofukivamag.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a78a577d---bepimulixoguwudemebopelo.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/9084626263.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/40757e0c1f023f45078e98adef956416/mitakasoz.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/21812288812.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092405a684d6---pufulu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/974824c8979cfc649c6a2c532baaff13/38878895994.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803ba52de04---60248234188.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/15101736850.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/fufukuziruzegibugabig.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7faf139103806ddbf5fe562f1aec5ba0/wibuxikolax.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac59570b1---62147665860.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/62458061958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=foreplay+on+sexPDF 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_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 17220 bytes
SHA-256: 6a3de72a3f422c247cc9c49f6e5f8620f5466e083a21fcad33d468b667ed6eb6
font_01_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 10248 bytes
SHA-256: 02023b6b8aa2d7495c5ba8c6ff6568d11e41e3523cf68079059ad87f0850bf5b
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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