Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4707df1cb25f0e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 00:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e29cb7d4b41feec201c4689acaa28756 SHA-1: 5209e30b79dbf6a4e1356fda986b7727d42afdbf SHA-256: fb4707df1cb25f0e75ab708093885e307c38baa3db109a13d5c902c2e299c549
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-only document designed to trick users into clicking a link. Multiple heuristics point to the document being part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a likely redirection to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://znalac.com/userfiles/file/11122665129.pdf In PDF document text
    • http://baby-daycare.com/uploads/files/202109191625296483.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210903225035.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/niwadazexotexokib.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090310525073499.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/27895798566.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/20369824908.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/daxudupagaduse.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/zajejevafikojiwenemipurud.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6902abf3---44507268287.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/werinin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a62b9cd---74218571976.pdfIn PDF document text
    • https://asiapharma.la/files/files/45510273656.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/13106893392.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/93953469296.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/porelor.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614209af80382---demaruvopubu.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/puvugevimogumiragir.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/68862606242.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/52944954617.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/27586738900.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/mitafamazofovonukalube.pdfIn PDF document text
    • https://e-room.co/userfiles/file/supogafegitiroloxusuxe.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/69383099661.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/3432291964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=princes+of+the+apocalypse+pdf+freePDF 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_off0000b363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 10832 bytes
SHA-256: cd5c28338c6a6fc5985108f0de1da026dcbfdfdb9e1e423772f4d22345bcded1
font_01_sfnt_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 14364 bytes
SHA-256: 45867390cbf3bd3472591a19b1487778166f83eb78b4c4d6d96cc2d5d25e8747
font_02_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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