Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1ffeb19b1f5e90…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 23:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d8c4bc3425892e1c0464efa70186c7f SHA-1: 0830b84b8f7c2929e479ab31edbdfefce2a662aa SHA-256: bc1ffeb19b1f5e900292cd53074371a2d14d2772e2ac5cf5766ceff74798b9e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d21a64e54f39917f0f925d41458fa4ec/pilurajinevapifodunadav.pdf
    • http://www.manorbymajor.com/userfiles/files/80675898527.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d4c43546---kivodunexerexutaza.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3986a4ff---11093102402.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003570f0e---pikirofilatamasow.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a142d967588---47222039130.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04530e1ec---watenuzevasijabi.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e7f73f5f---84862724882.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/63805535452.pdf
    • https://bookatowncar.com/userfiles/file/suzazirozuviwowuw.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae762f1e1---fepenobimazudedakekamuwuf.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5fa27e046---lexarejodiravimidafix.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3449fc8183e4779376148a6abe5f4407/36060407835.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lq2r2f40b39ea6odrfi6l889bs/40154965122.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/95351fc6fcf53856343b951e2e13d29d/meleg.pdf
    • https://cmsschoolkg.org/userfiles/file/51446225648.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/63094900708.pdf
    • https://travelstore.tn/userfiles/file/40122153407.pdf
    • http://xlpe.net/Images_upload/files/67839582507.pdf
    • http://littlepearlbooks.in/data/eimages/file/nugutomoderaresasuf.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg62q2s5j5ovaa96fq5k9ur7ri/gukaserarafonisewexawar.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e8391b19ae1e303f04757b7829372d0c/92941910273.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=isolation+and+identification+of+bacteria+pdf
    • 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_off0000f7b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 16792 bytes
font_01_sfnt_off00010fca.bin
fa7c2c60f0358be862ba8782ee7f256dae279dedd266431298e459fe5ce1b4ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 17348 bytes
font_02_sfnt_off00013c7e.bin
6681979881247b91ecd8a1479acc06cbab0f04d44870ee618af686473cf0869a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 10704 bytes