Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b443cc76b16a53f…

MALICIOUS

PDF

86.3 KB Created: 2021-08-11 14:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 683cbc1d7cd566b47784be561f14575a SHA-1: 795ec6d6c502daf9d1725c5e92da834de770db61 SHA-256: 5b443cc76b16a53f64c30db6cce04ed2eb778724ea1c9ebade5b74a50a09e8a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and URL patterns align with common tactics for distributing malicious content or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=cinta+de+moebius+filosofia PDF link annotation
    • https://gruppopolidori.com/upload/image/file/fudogafezosopefolude.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/54366029253.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/sosuselaxulugogej.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/71991172226.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/45096640921.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/175752652.pdfIn PDF document text
    • https://langumeistras.lt/i/File/vaperaxexelomapira.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/17861751178.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a11e1afdd0c610d32a8ec473673b2e63/57696344633.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/362479052.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1pkeqe21la9u9k92pugfsus0q/74007455460.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/19664143183.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/6830832599.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/48137917627.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dafb201e9---lenelowutinetorojedekis.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210716205413172769nhe19vyt06k6.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082979759da4---vawozuxulubofojope.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6f8e856e64dd02c0857c6e58ad5cb548/74184153302.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/vozamo.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/jijidijupoz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/756d1b0a212f1c37bd25adcb8d79a535/lugitowi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/25403810967.pdfIn 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://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_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 10688 bytes
SHA-256: b5d15c1d60be4d17f6f8d41d777e5df36eb05915a9e8a3b4220f517f0cc56df5
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 19748 bytes
SHA-256: 1313aede3fb7404b3fea8baa93ec048f91853c485d4eaaead580e8bb9716f1de
font_02_sfnt_off000134c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1