Malicious PDF — malware analysis report

Static analysis result for SHA-256 266e8ff01427b034…

MALICIOUS

PDF

96.9 KB Created: 2021-07-28 07:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c77533326faa4b1758cb07e141b981c SHA-1: af823613d26b5743b3f261994de81c6c4912137a SHA-256: 266e8ff01427b034b63c4f1bdfd0c9aa100abd8d5c8e1b4bbe2971dce673004b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting, characteristic of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious or phishing sites, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ibconsulting.it/userfiles/files/kemamal.pdf In PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/1326018979.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef97d8135---jozozuzezep.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/renijinemuvasutu.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/18983977427.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/nagesabisozabaxiwejo.pdfIn PDF document text
    • http://topas.lt/userfiles/file/tamug.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b31555a9891---20752693605.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/64449281269.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/wasanuzuforajukova.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/264829afa1c8c3851c88949fef1d83a5/78700222283.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/20454611507.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608523eb4b74a---tiwuboj.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc55dc8d58---4631497820.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a3a39f30333be30cc4a940f7b2fedf4e/tepalezofasevuxivejo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b08a9935076f1f3ee3229273887bebc6/fodotuzilatovalovurezija.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ac7922e7f115e423851ec60c71d8a5c6/44020961811.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/44880589393.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/wibanupo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/397tnh1m67m2th2nef13hfs4vl/fudevikovuregefuse.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd128e6f8---25753681667.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/21b7978eb5c38a5bcf88462ab0b1aa2e/68481881644.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/60907156950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hang+onn+tilting+tv+wall+mount+47-80+instructionsPDF 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_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 11176 bytes
SHA-256: fd03b14d1704f9c68f0091c0991770e4b8db7a8a608c617a7318d883b96d097d
font_01_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 17676 bytes
SHA-256: 2fb168291c4eb6354dc833192b9b94b51014640048bc62b65e7003e37b778add
font_02_sfnt_off00015d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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