Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2bbd80f4baa787…

MALICIOUS

PDF

70.7 KB Created: 2021-06-13 18:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6846cf94c1a3e6ea73c7cf2f647695a7 SHA-1: acf7eb64f8e27cc34b7723c0653044aaabe792c0 SHA-256: da2bbd80f4baa787bd9f27401ba9bdb3db50754053500a9cd1bda16a16087161
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, likely serving as a redirector to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=logic+pro+deesser+2+download PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8bl4n9os41f70udsp7o5mi1ce2/metixapebagatogamidi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/embveap91hot7ksni4ecgo1slf/fabobolulagifiromevovu.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/pirezedelitefowewipepufol.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/68605897903.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/xalariwowanomukagakifa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pctbrhbd8bfjsck6epdrmb8op5/gumejunigobakomonojujor.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb274e2a34---24615116670.pdfIn PDF document text
    • http://billsky.ee/files/file/vodig.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/87fe43f6f1b41c6295a5175256195fb2/jofibob.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608431724ff4d---77653495242.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9af90d07---fojazoraritugadiseta.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad93968654---gusovuwi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae032ea440d---33486575471.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rixed.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/zakip.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_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 5408 bytes
SHA-256: 3ef54ea98f850c6ce23ba0f7c2663fe1596f69aa02c6b0b66eda87a776a56032

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