Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61f9955bf22b824…

MALICIOUS

PDF

93.0 KB Created: 2021-08-13 10:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a31fcd1aac783c6d097dd4de173ae216 SHA-1: 5ddc301e1c7d32a3279ad2d0295fb7104da06271 SHA-256: d61f9955bf22b8249fe7e4fc0a72f55e310d826419a0f572ea822d95f4c15f8a
204 Risk Score

Malware Insights

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

The PDF contains lures for advance-fee scams and fake invoices, indicating a phishing or fraud attempt. It also includes numerous links to external PDFs hosted on compromised websites, suggesting it acts as a dropper or redirects to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/oe0sp15hsclv9sjasg3udkpvt4/paxiwosoxugapazekota.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/93136e5d773ca2b4f9e73291e823fd57/61806525263.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/96505423613.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/aefeb4eb2b76a795628623a50689e1d5/70065740508.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/99719352453.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f003ee86628---nolanubaxitexikulifitot.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/mc9m50qqlq5114c5vkvj9lhf86/55450794404.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9ab45dbe7774d9786efc892e113cda4b/fatifiwekurizapovufituni.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/13e9bc8263da8a2b0da9b6b58284508c/zolosadefobigipolosu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/2969724340.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/50715093290.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/59293005480.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/wosijipiwilemanobiwono.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/juzajadizilikenaxabe.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/iu1c0as6bra72mfirq3b29al14/66433896505.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/dofaxamizepijadu.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/lugeju.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/57519950414.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea975da20---84250998683.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f8ef8c96dd3d0345a39ea183220fb962/lejizupar.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/92311745048.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/24d6dd974675f04bf974814460d702e9/38690121008.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5de42ad6---nozuduxudarizibelawazezuw.pdfIn PDF document text
    • http://championsview.net/userimages/21787931419.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/tufadorulumigejeluvet.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161005b9f65415---ratuxedaworofagagog.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/25674140876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rent+receipt+with+revenue+stamp+examplePDF 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_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 17392 bytes
SHA-256: 460e1249e2609bb39881ee587749bb1eaa0e6bb4b3640d591945998d47e77166
font_02_sfnt_off00014d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D31 10916 bytes
SHA-256: 9b8f427d1adeffa4923d024118309d5e039b2720b3e7401a535e35e86cdd726d

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