Malicious PDF — malware analysis report

Static analysis result for SHA-256 c809064d334db434…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 10:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdc874e6d1c7597eaa1c41acb48f111a SHA-1: 48187f8c0cf63b370ecaa5ce9137ef82659e3c21 SHA-256: c809064d334db434ff9e21c58e23856ebec7f76f234b7b7e2703f707f0bcb7a8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence ML detection and ClamAV signature for a phishing trojan. It uses an urgency lure, claiming the user's bank account will be terminated, and includes numerous links to compromised WordPress sites, likely to host malicious content or redirect to phishing pages. The document body is heavily obfuscated and unreadable, but the heuristics strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00c0dd585---96598832760.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/83780d7312dea78645223610bcdec94d/kaxalap.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e410ba9795e0abfbfbe02455aa8af781/74395160780.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pivovevidepikip.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lerinurinanonor.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6ff8203b---38143440870.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/49750019104.pdfIn PDF document text
    • https://samowar.ch/upload/file/zidoxulozevigodo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/r9f7rf81a3mnros3nv12aptkfb/rakadetegolowemazo.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b72fef0ab047f6728dfa3fc06c1ac177/noduzunarevetarobipotos.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38833d0cb---gemixiwoxotiwokudaxum.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d8d9208e254528b8243dc73b86769414/26896685769.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9e794a70ab431e829f12fe87c3c29433/kazejoronesifezavavi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/16735096026.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c8c1e556d0b20564c94d64bed1fd125a/dipaw.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pg8jpnfq7s195ldi2sdestnjsj/99286788090.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/17983690162.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/17941480365.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/gukatubomidexifalefukenas.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58bf3ec4---28259233620.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lugipiwino.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/98vmjurp9msikbo8d354l6se50/49559049842.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2c59c879faeeeb42ed16a3400551d4a5/zobolurus.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/jemawuxi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/p7bm9nsffmckjaicvmmlk4hfas/nudira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bank+account+closing+request+letter+formatPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 11068 bytes
SHA-256: dc3e73483b59b806143439bdace0157a22341ea774ad52e766f4d15e3fd1f5c5
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 16516 bytes
SHA-256: 95be0dcbb5a1077e839a4a02aba4d70349a3d417ec52208bfcae91ebc85fda90
font_02_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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