Malicious PDF — malware analysis report

Static analysis result for SHA-256 295e63e3a570c1da…

MALICIOUS

PDF

93.1 KB Created: 2021-09-19 07:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0528dd1bfa14548b8c7fc5d0b3ad24c SHA-1: 3e2188418d3addf74b975941c8eff80c1041a76d SHA-256: 295e63e3a570c1da6cef854e95d204922b84478c6d019ed5cf119629e769c3aa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=o+sound+words+three+letter PDF link annotation
    • http://rsti.biz/files/fck/file/76319784289.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pajboabh5dl7ps4acih053ljna/86326090242.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ka392u90bhi92281gv57jpa6tm0gksf7/56199571261.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccd471fd4---96160297032.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/24445838120.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444a5e3bf35---soxisowofejusazofovib.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/jawilojumekeropapiroxin.pdfIn PDF document text
    • http://rs-entp.com/upload/file/woripinifibadijowoso.pdfIn PDF document text
    • http://topflexsports.com/uploads/33972574471.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/87152423923.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/80536195336.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/42000955576.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/57528548091.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144a10774994---vuxoga.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v4oh0d6j2h7i07232tg9bv4h8o/gupitozuwe.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b502cce40---21132826465.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401b62b40e1---41258900036.pdfIn PDF document text
    • https://rosycaffe.com/file/merepopazizepuvugezeru.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/setimebelizeduwi.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/37898501485.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/gebakudatuluw.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/gavejafixewiduwomanerif.pdfIn PDF document text
    • 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_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 17344 bytes
SHA-256: e67e394de665f62bd6a96ac97ddd5d5b7477b26652401e944cde63bcd3f5fc22
font_01_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 10304 bytes
SHA-256: 5db554bdb3c1fccaac2bfcf0e4e369be7337501f7a1a8eb542f7dea47d0e0f43
font_02_sfnt_off00014e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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