Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dd4830eb657e81…

MALICIOUS

PDF

58.3 KB Created: 2021-05-06 11:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91e1a9dd1eff2ed7bc2b413a120cf3d3 SHA-1: 80ba7accef60de421b94c211e7a9c6ad746836f1 SHA-256: 50dd4830eb657e81aafdb9f5a0cfd166c08aa47873f3c2712821b0b57eea43a3
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. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it may contain embedded scripts or exploit code designed to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8838

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://cructi.ru/uplcv?utm_term=child+apperception+test+manual
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/g5vb9thppntimle2jn9vj38ha1/56530870987.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd69f0d9cb---86528894884.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a500f9c2---83270308288.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/4f2e720ded2723a7f19e2c3f63a7b4a7/40789556667.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086040a89195---kojojuweno.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1b44667337a7172502db333659e87ed0/7966432733.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1668d289b95818acca5ea6cdda87b16b/bemomaxugusemowiwep.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16088f5d7f136e---87566971166.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092884eaa018---tejexopu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4b6538c6e352ba7924515d189d194be/vuwusoxeponoxevaxe.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075826bec8ab---mezonomoselulog.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6c5c2cfd30155960d0d15c321febaec4/janurosinarox.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/nmueu98atllk0b61v8nrbiojhg/40736006921.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/40c5f1ee02ffbbaa01982686ee0676cf/rokonapepazoxov.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703547dfc34---besovosopivabodiju.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607745da67d17---52911989929.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4c.bin
ed1f831ba74e352b1d9f465fc8152eae5afa8f3ee1453504529a64dbfc07c327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 5220 bytes

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