Malicious PDF — malware analysis report

Static analysis result for SHA-256 9626568cb4132cf9…

MALICIOUS

PDF

72.8 KB Created: 2021-08-24 23:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6be8a5fb7c9c33a500b01589839ff393 SHA-1: 54767813da067e9b0d00a9a7d06cc9680964f9cb SHA-256: 9626568cb4132cf9c894f953fe0c4b99c8bfd01a735760875ed5d6b24f09588b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites hosting other PDF files. These linked PDFs are likely intended to further distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/38fe7f7285c796d41a69d36a69d535c2/darifozoz.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087b658b7900---rasodeniwenasu.pdf
    • http://aklond.com/UploadFilesfile///2021043004430557.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tf04vs7olldlbemgb4ktikbu4g/74054452998.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ceba8a5296a---89833753804.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/l979ekj7n8rfhd3m7vufqc0vj9/94908225542.pdf
    • http://bycongroup.com/UserFiles/file/95947291945.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ri8dpqbatchg134kb490787vg5/furozimesoze.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/rogowom.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/nudiwijaluxizenu.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607deeb3d445a---91104817829.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ihaosjpl6oacsajdfq04ec68sn/27715970249.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/25306994786.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d2d37126---setot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60d86c2096---725797017.pdf
    • http://bogelaipigeon.com/upload/file/72098295369.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b770ac9f---fixuwedupomemisab.pdf
    • https://smilaxlabs.com/userfiles/files/gozonuzavo.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b06ee3714---pezujikokedaxap.pdf
    • https://amrapalispot.com/userfiles/file/39446367835.pdf
    • https://apskarota.org/userfiles/file/42345161375.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4cb855a62---xupatofagi.pdf
    • http://iphysiology.ru/upload/83501216746.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=guess+the+youtuber+answers
    • 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_off0000bd15.bin
b3166b8db2f48821e293cab64545d07e11dd50886d652898003459bf2b761e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 10544 bytes
font_01_sfnt_off0000d53f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 16792 bytes
font_02_sfnt_off0000ed51.bin
6fffd1b7d456946fe53029aebab33cf7d96f0cb98611b7df4583ef21255ef7cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 15624 bytes