Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7f465606bbe175…

MALICIOUS

PDF

70.3 KB Created: 2021-06-06 15:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ef920a072d1790876d1b571e8cd5628a SHA-1: 3bc38967209d172d4062b6753efbdae9c799651a SHA-256: 5c7f465606bbe1757be9e89583fe8aab6693f42ff7a901870da267eef0b0d6e1
156 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crewmak.ru/uplcv?utm_term=how+to+check+your+t+mobile+bill PDF link annotation
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/548fba4a6c459d0e314c4db810a75de6/ruzowetitavizim.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7dfd8865---68645442489.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810682b03ef---1950027026.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pnmjqv3iublgbvboqv9eng7584/53844884397.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160742fbee3fcd---95440641930.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/76943183046.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8b54d2ad---bewiviwafugujaw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608084e849904---51993696983.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088edfd4a259---98663209776.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/zizimud.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/nutizu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160943a4ebd26a---toduzivenariri.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791b11adacb---gowapoloxipepusinofima.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bdb5bcac8f822cc986f1e74de1da99cb/nanivekubi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sidujoloxobuxadonuzam.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/fussbb2rpf8lvafhu1s5gjdcp6/12936537722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 5008 bytes
SHA-256: 8e3305402d12375f3f24ad2127ae5ed083053ceceaac71ceaf99729c945ead41
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 11196 bytes
SHA-256: ff908bd07e1cc6665066108bf524417492b4b6f40ff05207ba1eded515aa41bb