Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fb444eadd7b30d…

MALICIOUS

PDF

66.7 KB Created: 2021-06-01 18:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de606334b510e89b11c7dcd04238c9dd SHA-1: 4324a7a9ce2ec831d657c6235edb0d7eb3ca1832 SHA-256: 87fb444eadd7b30d34aa9a28c547128b0e427c57609474433a1c6e52d6a24249
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO poisoning to lure victims. The document body text explicitly mentions 'Free download xforce keygen autocad 2013 64 bit windows 10', indicating a phishing lure for cracked software. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8612

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 http://dermalab.pl/userfiles/file/suzitoxorijov.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0noe8kr439d86ghcdlhpl610l8/61106722952.pdf
    • http://agiusfuneraldirectors.com/files/file/xerupedabuji.pdf
    • http://fullx.net/files/88563831931.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/deeee5c3fd7f54c3ea6d17e82f78c439/32028699206.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/61cf2b69025f373a4c574b48b51d4b72/17535833250.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/wolimi.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cc1f33e97d2836c7e295d42e46c4d64c/94972998184.pdf
    • http://pileshoppen.dk/userfiles/file/bijiteresenerasenise.pdf
    • http://bannermaul.com/userData/board/file/zuwivinewajonaxinas.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5de3eb8e---pixozopugib.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab77433c---lupubebimakeguradev.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a604db79e2f---bezenurafuguxixidure.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0c4b48fa---6570456769.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b574bbc1a3---nimewazujuvafidaf.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/palogimilaxamodegaw.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4425e9bd7---kenokom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+download+xforce+keygen+autocad+2013+64+bit+windows+10
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a7.bin
090485b1e9198028f70b51bb810c6841a36c47df52a5d373d1237ed47cc402bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 6340 bytes
font_01_sfnt_off0000e770.bin
e2726a86bed20730e4a98b67b2ed0a4a9129c1cf826d4e97edee3726f3c7d44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 11636 bytes

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