Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c37609f4069a57…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 13:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96b39535ff09a193b940cecc4ab360e5 SHA-1: 49910487f1b045e0a492135975c3ad5cffe90ab7 SHA-256: b7c37609f4069a576f1183b8e62e4206da73d47f92a5cf2c428feaf301ce0a22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=mha+season+5+episode+15 PDF link annotation
    • http://infinity8talents.com/userfiles/file/88694711177.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/rolaxavenototexonav.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/seweveledexelorel.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/eb3646868525c6cf901f37b8d909eb1c/paden.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/41244988673.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/71464035794.pdfIn PDF document text
    • https://projetovm.com/uploads/files/73578878723.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14510689970.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/82788447553.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d37d8dd41---74736852538.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/82790277519.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/39923702060.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/53837204433.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/87566911372.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/liniverine.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/jipujobido.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/13484190580.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/42244790818.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/13462788505.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/92614274874.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/53416286250.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41d50e6a6---pelazeli.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/10838206706.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/bikob.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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 19156 bytes
SHA-256: ca3bbecb770e20a31db1c64ed8d93d7c0924539b8de393245b5aa251d8efbc9f
font_01_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 10424 bytes
SHA-256: f461156780cc8d69de828c3e60282d67fb65e210ffe751d6e4cd1a6b3d775c48
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1