Malicious PDF — malware analysis report

Static analysis result for SHA-256 493eb9c2b4540246…

MALICIOUS

PDF

73.5 KB Created: 2021-06-22 14:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 69fe63d1522fd9f04e7fcc556f897cbf SHA-1: daa1aafabd64ab9e339aca87f5f998019e83fabf SHA-256: 493eb9c2b4540246c735ecd796917d5f2e753e3caa643962f8803b095ccb6dd2
176 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=separation+of+employment+certificate PDF link annotation
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58ad87e60---1962172728.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20b7ce2f32---59753578092.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/4r68vbelpn1btqn5ph9l7qj336/24909498000.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01eb135d9---zeribenodim.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gowozaregilewina.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/jupopenerevisixixe.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/51150e03e8af3c9dab328d7319aa8813/17659093442.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f368b9917---dilog.pdfIn PDF document text
    • http://saptpadi.com/files/file/93671038704.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995536df486---17153815383.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/70c96bfe41155729b5b31fc8017d501c/nifazezowagutofivoxoved.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/jebolewivomudufujuje.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c20272ee22c---gebavip.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608266e1c59c4---zinibexesisubovazoka.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/vomivupavagev.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c825052efc---mafudunugaxim.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57e8ef6c3---47725165087.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_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 5188 bytes
SHA-256: edb09c5b362b384f7452bbdfa4220a789fc45386681a207758de7c48302ab6cc
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10976 bytes
SHA-256: b552f8aba3ae89e98c8f12366d707d6b0db06827b652ee9198647a689caac7df

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