Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c8bb28e7e67a6a…

MALICIOUS

PDF

63.4 KB Created: 2021-05-06 10:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4638278d5ab49553bc0b7900042dac1e SHA-1: fcea1c0fcbc7499b563dead65779aab0d2c535ea SHA-256: a1c8bb28e7e67a6a01df11b19b35e8cf97c544a2f81e829dac9bbdf3dd3f4aba
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8518

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 http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2ddb34c5---jenexowidove.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129c3c6458---86745505135.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070034bf3610---xatuteboxugujunoxavumibag.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/bapokeroxob.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba9ad7c9c---modusozarefurosikaletuvoj.pdf
    • https://anmoul.com/userfiles/file/35957891612.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e2fdc2b49ce6f45f7b91cbd114c952a6/diwipopeju.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700197db78a---xakojunodipilevawe.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045bb2668b---ronugorezowubimilasugopa.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pstsmpvjqc0uqbdsppfgm453b5/xipuz.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b72a89e15b479083637e4af7eab8bf85/sugavejexog.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc4ac8a65c---vaborofu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c503b7680c---wifokobuvolazimav.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9178f1456ec857e4115233e03781e331/kizuwa.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e8066b8d52adb46726223efbb204227/kojeginifevojil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thistle+hardwall+product+data+sheet
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca1d.bin
668812d89bbe4a3c3ebf608ec3a6f352177a1e254e75d8c3a628420ccf42175a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 5200 bytes
font_01_sfnt_off0000dbd9.bin
5ade0b410cec0a0c1f5e8b9626114245db9c7374834a4ab2a2f91949caed18cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 10936 bytes

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