Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a459f45d90a217…

MALICIOUS

PDF

74.7 KB Created: 2021-06-02 13:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d2310ecb746f3b56c738ceb4e0f5acb SHA-1: 023b30e16c551ce5cc5268cd159e7d1e4566a2f6 SHA-256: 77a459f45d90a2170780dee3558e022f31e9de8c61d83458f5c5220e7d2e8c6b
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6580

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/4udb6jlvn4jio9g1uioh5lqkcn/wiperovesufugone.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c050b523824947cb68d0cb6bbf0d58a9/23363423758.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0g2lv9gaf2dl913mc3kh9cg67q/tudemutufunifatigesufaj.pdf
    • http://bright-inter.com/file_media/file_image/file/surotegebagodipalokiro.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4f7c86c8c84fda0134451c77efb302a1/80709471959.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a9d543f423eed37ec677263700dd200c/51300901540.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e771ad5ad---83890998854.pdf
    • http://market-oborudovanie.ru/upload/file/nunefupimakekatu.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f129538492---54694966550.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c05f6aed7---5640620592.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/96c60a30b3f88b3b982528ff263aca59/luvunopukixupadipegilima.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/v7701c1l8bnt9nfhpmfoifguui/korosujezizinopizupoj.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609390ea1457e---wukixumatasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+many+episodes+in+tokyo+ghoul+all+seasons
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6e.bin
7e1476b69003141e84da06425115d829fc9fc863c506795596c176bc4b67e7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 6568 bytes
font_01_sfnt_off0000f533.bin
113bdc9f4ed68246f356e81d4da97c4f19ec483f57c33b0fa063062fb68d0e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 5496 bytes
font_02_sfnt_off000107d8.bin
a9e61559c686c4a8399643155e9ba1ab5c4f4f10f6134d7ea3b98d1ad3497e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 12396 bytes

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