Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a638746a938391b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 19:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad6554775bf6561d94b471b0be2a2c2c SHA-1: 5ccc0ec537d51354359d0df648d1e2d5de920695 SHA-256: 9a638746a938391bda0e336d231820b672187867023378f3a2f720192b995bbe
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 5

  • 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
  • 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 https://crewmak.ru/uplcv?utm_term=dictionary+english+arabic+pdf+free+download PDF link annotation
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad0d0ce3c---tesisijipebaviximidilix.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/jugabolatakitokakojijax.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/63314454371.pdfIn PDF document text
    • http://armanetti.com/images/girejubisedenikop.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3755b271---70853329821.pdfIn PDF document text
    • https://bamor.org/userfiles/file/linaxuxazuxivedujuri.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/dumepekinida.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d27ucpbbhs9rhp6eoinb2ci5e6/27640101814.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/95294673720.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/wifazoniruz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0102dcdc80---87774986541.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/pozepedenavuwolesigipirij.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0cd25cd61d3f91f0cb3e65134560da02/11423180183.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u6ti575sipl4coeincpot3oui3/xopiz.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/29851575362.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/084e27d739cf00a1ca45f1b6fc6ed838/69846469480.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/29897266129.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/37773408768.pdfIn PDF document text
    • http://derma-dts.de/files/file/54364160503.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d74045fc---mezinawetuniriwatuje.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701ff2b32c9---bokowabarudunigupikabowu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8j3ulojqaasrm44uhbuksnsuh1/maros.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/855881d0dc3df877360d3d851f9c1a56/74137526202.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/isifoligunixegom.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/zizifigasanutekigalikeboz.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/54505809134.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 11240 bytes
SHA-256: dc0fde9f31d2f66ba85372e2713de058ea83920d9aaa5537a84c2d52addf6353
font_01_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1