Malicious PDF — malware analysis report

Static analysis result for SHA-256 8656a7b9083b30bc…

MALICIOUS

PDF

192.0 KB Created: 2021-06-06 06:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1bb299fd999f7d5e522dd8d356cf0bf0 SHA-1: 9e9a309a54e6b05631a719dbf269ab12d8050bcf SHA-256: 8656a7b9083b30bc4ce2ca7f9961d6f47e8b555aa16a024e68817e77c705894d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=derivadas+pdf+ejercicios+resueltos PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4aad302b1d61bacc930e6a3cc51e5744/ponulowu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/jezekikutugimogazowo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xalumofejorojoj.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/gafobebum.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c714a4fa9---68946685218.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/m6rl2jr0i712qbbj50i71gffi7/fabuzogamogikizuko.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4rr4o1hr0ceoug9t9jdlvi0nq5/15144069297.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0ae55f7e---suzanuludewo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608329410276e---96398779328.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lnquih3bdrgtkuaai2h0sqdcn4/36045201309.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/foxunabozajefi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b2cb7718---3995854300.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/70995677549.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b94f4d0212a6c0ac9bcaae3a1eed7ae6/82735640400.pdfIn PDF document text
    • http://momsystem.ru/public/file/17625465452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002a31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A31D 5284 bytes
SHA-256: 3c970a34d64ed7fc66d518a76df007b37159a9f32b88911b788a07941f54b677
font_01_sfnt_off0002b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B534 2884 bytes
SHA-256: ca50b83e0ab24fd522cc99a7b73be7ea6e2eba4d174d107363f01e72e83de667
font_02_sfnt_off0002c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C105 14932 bytes
SHA-256: 37dc06e37d26c2a51e6d73da433195210e12b9f2104f10876960bd153f4bcc2f

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