Malicious PDF — malware analysis report

Static analysis result for SHA-256 3432f71af2c132cd…

MALICIOUS

PDF

65.1 KB Created: 2021-05-20 15:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d95f56ba6de79c48da40ac0000a80d2d SHA-1: da6f06699fd8bd0fe966406901a948511d31b84d SHA-256: 3432f71af2c132cd06c6024f105e560a387b069c8705ef597c574cb03a503c5f
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to mathematical exercises, likely serving as a lure to disguise malicious links. The embedded URLs and link farm heuristics point to compromised WordPress sites, suggesting the document is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

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://nomylo.ru/uplcv?utm_term=ejercicios+con+angulos+complementarios+y+suplementarios+resueltos PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0777b5044---24668663802.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7fc8072bf35627bb20451144e74eaaca/bonakidipewufaroxerab.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c31027174---bunoxubi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cmeuc2odfq3qt12sheefefjam1/97106889639.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/pobumoredave.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/44a98e3081923c4185eb423f223833b6/6996273245.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe16e1734---22137635305.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/om4sr9a50338123sf325jqf1jk/bemepuzalobarurebukosufiv.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe88d6f20---pejej.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/78942275838.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/43f33d0c79b7656e13d98c01f172db20/bagadurukesinak.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4424d56b0e58ebd87195f28decee65ef/zuvinazanogaselukulex.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/95bdm0ct51nt1igdbva2el1fbp/24497822980.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/419b0932a70afb47db0fdb7703c3a3f9/nefexobivixifoderon.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/tcam4ufds9vkveb50i81jsu0fu/54693547008.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/nazufedobodugi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/64832572858.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4650ec7a7d---93195542860.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 5388 bytes
SHA-256: 92346bdb9d070bce8e1a56b46520509aa243704d085f3b339517d61f06a67c78

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