Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6da5f0508188917…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 11:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 736843e3539c45167940ca4a3b7494af SHA-1: dc477d171af3fd21d8d3fc2fde7259b03b524bb5 SHA-256: b6da5f0508188917f0934be3063f192fece578318bd38f47653ed739f0096421
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://whuntex.ru/userfiles/file/36459233065.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ba1b55d01810894833669d99e487656f/zaviwezisupewujagok.pdf
    • http://asbufestival.com/uploads/FCK_files/file/gowobamofuxe.pdf
    • https://airflow-skateboards.com/upload/file/jabowefatanuk.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072582927049---ripodetiri.pdf
    • http://nmglyxx.com/userfiles/file/puwalusenodajepita.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddfaea7b4---kitivirixerosa.pdf
    • https://pet-fashion.ro/mm/file/10302798737.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1d661e51---9090231956.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/19460934530.pdf
    • http://efuegypt.org/userfiles/file/76089536166.pdf
    • http://polymer-optix.de/userfiles/file/82263285853.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lrb8ivmiq0dim6b7qspjg7dur3/56083039181.pdf
    • http://sjhrz.com/images/upload/File/35138653859.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b4a5f10c5bf23bc66b5b97856770e844/wuzarusanu.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a5a45cdb704a2cb2d398e02307ac4dd/getewixekoni.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f3886e83---wosutaragixuzivegepefub.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/caad2179934ba2f16738088e1373b3df/13674094901.pdf
    • http://nebovsem.ru/app/webroot/files/files/bunepigorej.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/9c6714c38e4f3313742f0991456a5b55/fepivaxokaliv.pdf
    • http://atenngo.com/admin/sites/site/documents/gelakovulepuxunami.pdf
    • https://tyeetomsfishing.com/userfiles/file/90357592177.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3b8d03209d5f3ae1e03835d0364a6162/zumerokotixoz.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/16bbb80caa2ff592f59340e293480817/73998673810.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=extenze+reviews+side+effects
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79c.bin
be910c07b7548fa3ebde47a9adc6eb4be759498c0cc65c941440dab1acd8f9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 18236 bytes
font_01_sfnt_off000127af.bin
1a53199d163f351a38f9cd8598a3cb9bcc86caf83bdeca82c159de600de27e0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 10440 bytes
font_02_sfnt_off00013f94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F94 16792 bytes