Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a9bb2990dcfd14…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 08:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2e54084107992e22b8791087543ad12 SHA-1: eb45e4f19adef2c37f6cf53a46af9deb2eedd705 SHA-256: a8a9bb2990dcfd14637186ee3816d2e9761a163b1e989b74d41de7a72bdb3e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection scheme. The presence of 'utm_term=mortgage+calculator+excel+sheet' in one URL indicates a lure to attract users interested in financial tools. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f06047ac3---fitikilisadapesow.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1f27a96d---mikoledelinamefajetozasaz.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5231e910f92123bb2a16dfa2c4f7d903/21307120050.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/34092853973.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610614e515cc4---jamidozeb.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da051d1b25---fejetufamoduzeb.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/sijeredonadikope.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/wijogewarenufazekepe.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/muwekode.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf4b64dfc9---fitepogabutuzog.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/29822650046.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/fupumoluponazejesabe.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/tumesubo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fb7c03d08---64145158004.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/regifafofa.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/9989467329.pdfIn PDF document text
    • http://prograsifkalip.com/files/74868770617.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/d0lm9v931qkh9g4v8nmu3hg7oq/93840273346.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/jowafovojoxatabojemi.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/lerusifazolejuvidemej.pdfIn PDF document text
    • http://waypl.pl/upload/File/93350748891.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/segemuvazuxi.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/xemesofeg.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/86795616820.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/09jlvd03qrhteu7fbsggthni6q/46346511122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mortgage+calculator+excel+sheetPDF 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_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 18132 bytes
SHA-256: 4a5f330db7d3827c214e7539ea0e17f4d788fdc82645578b9b607b5df253933c
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 10508 bytes
SHA-256: 9c29908d932727151dc4eccb9eea3b6b7dc2d5366c32827d548788d420211647
font_02_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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