Malicious PDF — malware analysis report

Static analysis result for SHA-256 229134bc2f1d949a…

MALICIOUS

PDF

102.0 KB Created: 2021-06-09 15:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 682674c79aaf7bdaee0d5f16207118d4 SHA-1: d108d7d2edb9b0d9b2db6223ba3f40e39fabefd4 SHA-256: 229134bc2f1d949aa9fb68cbba2087c5b8041b3cb1ea96dbc97743da4a0fcb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=fut+french+conjugation PDF link annotation
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4743c36af3dd4ac1f22ad8ddc23a77cb/74448240908.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0a89d800---43160074173.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/10071759100.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/60147d273e77afd90f2426b1a010c95e/1195404244.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/95667735011.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/bowek.pdfIn PDF document text
    • https://avenue102.com/uploads/file/sibilorevedebavaxironit.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/xugegotuxufoxolekuvig.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/viduvozekupamedurose.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607423400808a---ginedodi.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/jelit.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/99af584ccf565369252f3c6e64a1150a/94994482343.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c57a287db---74026807300.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7ajncddk2e4ptnar9tmqvhdhj2/30219436167.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00013569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13569 4964 bytes
SHA-256: c4441f9aef07203061c01d25caaca574f8ab38308a5e08f6ee754ca982c3d622
font_01_sfnt_off00014657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14657 14576 bytes
SHA-256: e9230e9ad862293ae224b1b8b741c7b6fe6abbe43baba7582b0bcd8d0cf8458a
font_02_sfnt_off000174c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C4 16100 bytes
SHA-256: 26b31ba2131ae2f7da025a7fda5e9dcfe79fc1d25f6641dd8c13613e564b4b69

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