Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df4dd90d87f49ab…

MALICIOUS

PDF

70.8 KB Created: 2021-06-29 06:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a9f126fb59ccf494e0fc7e0ff0351c5 SHA-1: c034c24606da51a5761ebeecb82ea05293f78bf2 SHA-256: 3df4dd90d87f49abc2335d3f96fc3d9cfe1fafa583322430d9f86f2df9aa0407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting user trust through a seemingly legitimate document to redirect them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/up8vlkkl13h9bhj51slf1bpqq7/manimalosujozoselovi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ma0pnc4ukdlso6pgd16716r4op/81148051887.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4f54c6518adb163949aeeafb5a4d8b59/99053623264.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/41ec9fe9340cead298e3fd7b1038e498/bululuberujurezajif.pdf
    • http://star-transform-moscow.ru/uimg/files/51628423102.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/4bbr840n18l47h9mtgsk104beb/vuxelafuwilubisiwip.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abad0c9cf---mudafobugibak.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ab699ad0a80---78272832520.pdf
    • http://efrex.cz/files/file/viwatit.pdf
    • http://aitrans.org/UploadFile/file/F1202105211218472600.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/90ebc5bfa2be3604d82e57d85fd049ee/roronejibonotesoxoxuti.pdf
    • https://cardion.dk/gfx/fckimages/file/72593246106.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4dd9c60d7---12681097039.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/cf8902e3c1a6ba9811854f9a7aba248b/1174819524.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607009293d715---26359989451.pdf
    • http://remaining-mc.de/userfiles/file/70301381833.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2o439g4a51qj5e4ve3s3g6ae6t/7656711610.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/638bc9212328dd366b468670ee059707/xukuxinonerekubutikusosow.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/sm3euh61qdiidugq1punhch6jd/97567290685.pdf
    • http://cupta.org/userfiles/files/20210529001502.pdf
    • http://twfbs.com/ckfinder/userfiles/files/1453116544.pdf
    • https://imotrading.com/images/userfiles/94976894263.pdf
    • http://firegallery.ru/img/upload/484824617.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tv+shows+like+mutant+x
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6da.bin
cd1875d5d1dcbfa250d8dbd399ccfb0c3932bb84e0c46c16ba2456b0eaa7adb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DA 15288 bytes
font_01_sfnt_off0000de47.bin
9094a7a28c2f854df2fdaeff5600208a922babd5088a9f12670671290d306efd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10684 bytes
font_02_sfnt_off0000f6b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes