Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5df489068b2b9d…

MALICIOUS

PDF

93.9 KB Created: 2021-07-03 03:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ab1c9db1ae0b03d87e858e3c07f9f9b SHA-1: ceb88d06d3649962ba4fc44ecba840d53fb9e292 SHA-256: af5df489068b2b9d1cbf2a458f7314f85426f66e07810cb0e7413e0540ca7218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crewmak.ru/uplcv?utm_term=how+to+draw+a+portrait+from+a+photo
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/k74nc7a407l25vstbf3qgb4mj2/gironuba.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d75ed556a---buridukaripebiwevuko.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c0n0rh0hu8f3qkutgapee3abqa/dodekobakufidadurelisoboz.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160809d6f6a743---wokizo.pdf
    • http://kuppersbusch-center.ru/uploads/files/55823293673.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be24e6c186d---31334153664.pdf
    • http://antoniolescio.net/userfiles/files/wiwud.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dc56d805---48552267294.pdf
    • http://kco.su/userfiles/file/24764890146.pdf
    • https://acgroupenterprise.com/userfiles/file/29957471262.pdf
    • http://thepnguyentran.com/media/ftp/file/93365756065.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0e2cfa29---89708371008.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/96275423016.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3808af2c9b---jimomosujetusumuxupituw.pdf
    • http://lab4050.com/upload/editor/file/56693468852.pdf
    • http://alarmy-kamery24.pl/userfiles/file/92909489867.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7c6a96690d2a7f1ec2d09f832ed7eded/11765278323.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vuwoxagofufatu.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8042ce1f6a---69367190140.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8m8inrp9lau1o050laqgd9c2bp/48994776405.pdf
    • http://jjinline.org/file_upload/file/zisaladatagasetujeg.pdf
    • https://blugarden.eu/file/55486572392.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/prfmnjrgd60k3qe4g2qu3v01v5/tixid.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_off00010ec9.bin
fc38ef5c17b86dbb66c5108c5ca93a1d327529656ecedb3632788dbd0b312954
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 10392 bytes
font_01_sfnt_off0001263e.bin
e6f9f565077705fa2d0f1045b66c49ece546bfa0b447019ecb89b72511991b1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 17076 bytes
font_02_sfnt_off000152f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152F7 16792 bytes