Malicious PDF — malware analysis report

Static analysis result for SHA-256 2135e6e3a8a6bea0…

MALICIOUS

PDF

74.8 KB Created: 2021-06-12 08:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25841c0231890bccef1a0e620b6e11cf SHA-1: 1798c339f0352520521969a5a6a5f422cf3c9317 SHA-256: 2135e6e3a8a6bea0b24c59cb3839316b2a103a0616a986646c52ea78cd837eb6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

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://ketchas.ru/uplcv?utm_term=uninstall+android+studio+ubuntu+using+terminal
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a2h7v1lm40ajbjra5uogbabtcl/35638276932.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/36f3a32581249cf739ae20d031a281b7/zovinemububu.pdf
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/xibafabuxe.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9a8e8a481a7a5f45ba27e64aede9f365/56373078216.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944804c03f3---78191182105.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d15eaf938---vovovilewenapa.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16229252495174.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sbmpuvfr805rdvlur11lnkr75c/wilisoxawefowizejub.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0c6eff82---83192615999.pdf
    • https://stillwaiting.org/userfiles/file/77592463985.pdf
    • http://wittlich-luexem.de/userfiles/file/pezovenogunozajorokipuzum.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0b3be1a3---32584754871.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5242f8927b---65943791460.pdf
    • http://monkey-do.net/userfiles/file/wozemidatakulik.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb1e9b55a---50541283835.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58a.bin
922bef636410c18032b733d875aa6cb70ded33803099b456fe9c8fcf42e49ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 5276 bytes
font_01_sfnt_off0000f761.bin
016a85f5fc42c83512392b7159cc962bcbeb7d6a71286bc953c7ecc793d9ef4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 11368 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.