Malicious PDF — malware analysis report

Static analysis result for SHA-256 662ab4f2ef2758dd…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 15:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6beb3abcea81aea647d0d85fb7ea9a50 SHA-1: 02e45078381238082011270e34dba8f351668ad3 SHA-256: 662ab4f2ef2758dd8fc4461178a7b5cc0fbbf7e37733c72b801bdcb17dc9a37b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, further supporting the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5544

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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb5245a83---18743509626.pdf In PDF document text
    • http://denledmpe.com/upload/files/jewigoradonesinixipigeg.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c2261af09da4edca1ce8caa4aeeb53b1/94220910595.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe839d588e4---gagevuzabebafuk.pdfIn PDF document text
    • http://ipublicity.cz/data/file/72855803892.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16115e1636e6ab---33505440023.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/37dec206c2e56ddf6cdbc5046a2c7263/64378188528.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/56hrmldib5guv811folecevrip/nuwagunodepu.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/80347539272.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/tejujizimaditoge.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/5b74570be6edaaa1152bd64a7f6c1ed9/15467617723.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/67c59cb0a82da2fd12d78e52a2aba187/tejotetuwibeladelet.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bijisizugozujabufix.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/26510751750.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hl1r4c0ue322fa9k8ar1bbcgtf/72021386653.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3a70984e---pusaletujimuja.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/64130783043.pdfIn PDF document text
    • http://learningkey.org/userfiles/nabegun.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07afceb8a1---11592968323.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/zakekaganimirodar.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/79181437445.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e3681c03a2e185d989a6ee15b5798d2c/24929209272.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e71cdc1c3bb673ba083a166377057102/nuxazujutuxexozopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cyber+kill+chain+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10708 bytes
SHA-256: 29264191eb1bd136d23f626820660106ce19494d0347f1a7b393cb4af84fc234
font_02_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 18348 bytes
SHA-256: 4b1b5f151cf7a0d4e2a7dddc5ae689e53671e9bbb44b88e30b75a90a8fc4ae29