Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad25a89828b732fb…

MALICIOUS

PDF

165.8 KB Created: 2021-08-02 17:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f5aaa5f982db11bc3aabf522eb3e05e SHA-1: a06e3269abfc0f2dcff98ec3bb72fe968b7765da SHA-256: ad25a89828b732fb385f2f61aeb9a8b02416e8bc54aba002a923a6bf30aea636
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1110.004 Deniable Authentication: Multi-Factor Authentication

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It exhibits characteristics of an MFA or one-time code harvesting lure, suggesting an attempt to phish for credentials or session tokens. The document contains numerous links to compromised WordPress sites, likely serving as part of a link farm to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9522

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa52f61170---42287392358.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2ee2f0424e745f830cd3fd478d9eb373/nofodulugun.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d418d18b0c14d337d0684e786dddbf16/60929028994.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/59789593613.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/vekewigavoxaviwonu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vi0cqjt9fnpsaia714bcu623kf/kugirobusoduledo.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/pufese.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6213efc728b3f1146364b599ce809855/15760473111.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/38547292120.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5341805502e27ca034a6e1d5b5374e56/zovurixakuxilejabe.pdfIn PDF document text
    • https://sapporopools.com/contents//files/foxadomeniwexaluvulibak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed317ef811---30487124056.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/q58rnd1hvhv6l6ip64s55ok0u9/velexitozubivibupizutuvif.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5a257549083b64d56043a674e88dd1d8/posabosokinarole.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ki5h1jkbn9jkmuu0ad69osn6r2/40857183527.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3fb26750---vekexuradomowezopesewonuw.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/jerugogat.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/gorarof.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/60416571225.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/roxupakoluzodebetu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/137cfa6faa0ceb03fb0213965904216d/21954650594.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/25169287692.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/luvodukurudutogegowi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9d7992ca8be995dc290ef14fb6e943c0/53535901684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=english+spelling+rules+book+pdf+in+hindiPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20539 10832 bytes
SHA-256: 086f65f985c757945bfe6114f3cca23e835e5bc94cc3bdae503fb2611a3bc13a
font_01_sfnt_off00021d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D99 23956 bytes
SHA-256: bc9389373485bf0c522f6fbad7183850898930f394f79f0049c79607aca1e946
font_02_sfnt_off000259b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259B5 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off00026fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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