Malicious PDF — malware analysis report

Static analysis result for SHA-256 86828968cb88b8a0…

MALICIOUS

PDF

88.5 KB Created: 2021-06-13 07:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 98f1d080fa658c02f5f50560514502f2 SHA-1: 223b656a197b6a54739e2effd35448219546f391 SHA-256: 86828968cb88b8a0674444b219b668a3a64970216add6dbb44050eb1e8c82a65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=coffee+break+french+season+1+pdf+download PDF link annotation
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/14461880766.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6216hkfurrqbvu9ikhj31am002/lubuporuzapaj.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e853a830---nupatarigolozekekar.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078055abfef1---25892244467.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/917177f77fc0e153157c7aa61b382602/90007408669.pdfIn PDF document text
    • https://stopserv.ru/files/file/vibesub.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/nisoxawunozodonoreza.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/bagabalemajido.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r8tvna52i9b4psm341ec220f75/linaloxutogudi.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/redimetinep.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tug1vk2uimoae122lvfogrivkb/37305692130.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/17463383571.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/1l723uvqdk0osdkbulj1ifurs5/tutorageginemupevap.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5cb2b54ff9b94c682e387c0d9b2a1b68/xumikesuf.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1d284c96b08085f4a80bde011c6ded72/71215405818.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/bekefokoweze.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/55083432948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 5272 bytes
SHA-256: 1908c3ea7e1177deea17aede6fb074b11948c11c0e7e5acbc75c3fc6be4dc0cf
font_01_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 11652 bytes
SHA-256: 1c96ee87fa5c26a9de9a3061399833e2f57e736f38bcb2d6f44b219225f11daf
font_02_sfnt_off00014511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14511 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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