Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f519fd110d4e81f…

MALICIOUS

PDF

60.2 KB Created: 2021-05-09 19:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fce47dbd9bd62ec0bad508233e96a7b2 SHA-1: d22269b1dd6028779486c8281fc51923d36eee9e SHA-256: 0f519fd110d4e81f4b1927874b262bf2dc0673c226cdd3358218fcda781b6f22
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure victims into downloading further malicious content or phishing for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8093

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078eb9877a74---zopunuwejisumopes.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/90ed4ac1bbd88bfdc52471c11a1d447f/dajizidezivumofuk.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/96c1f6eac1a6cbcaf047bbbb106bf27c/fipigare.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/g5593mgvc4s569k5s0tjqn45ai/1069609885.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/004c4eab9fe10f40fbaac23098097ac1/wobateneda.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pfqi0p1p9capokjivgjkal4pbi/lizoruzev.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f9c4e9d7b7418df43f691df9317f7560/zozewafaxixalamokatan.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608557596f1a2---15745905298.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a04da30fb4e9b251d0ea6f7635ab4351/94905800106.pdf
    • http://aggengr.com/uploads/CMS/file/somabasu.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607884d74222f---ludexezab.pdf
    • https://arvikabc.com/images/uploadedimages/file/87574781121.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/be50de3e0fe0e392ea39559bbcd1ad8f/xamojaroraxewilogizaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nice+guideline+hypertension+in+pregnancy+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d557.bin
3bd7eeb774fd3be51f908fbab58f877890c1ddff8c37855cc2a4f6f7561a60bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 5488 bytes

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