Malicious PDF — malware analysis report

Static analysis result for SHA-256 1103f52d33a8babb…

MALICIOUS

PDF

77.8 KB Created: 2021-05-27 18:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70e662065cbe6265f682a47491b2116a SHA-1: 4c247f3b146db6c0599ceb89326e703d073b9018 SHA-256: 1103f52d33a8babbcd2e76a6089467310b96eb1b076a29e63eebe0b2157488b3
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious 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://garglob.ru/uplcv?utm_term=7.2.4.9+packet+tracer+-+configuring+ipv6+addresses
    • http://anhuicrew.com/upload_fck/file/2021-5-9/20210509222752635852.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c4bjipbs7d4u10bu2j0viftrus/57650220218.pdf
    • http://kaies.cn/upfiles/2105251610204231428fz8j7.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d939bf8aaf9653fc1dec91bc1541169e/losenabefotomoji.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/rbu37q8ir6hk8so7hvmg5h3tk4/1275654100.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8173c7b8---60650804527.pdf
    • https://sardavetri.it/userfiles/file/5223834945.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bfc310136---gogudogasaxogida.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb68d27e6---nilotip.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/cod0be5cjc25jm6ubfb76ld1c7/14295501166.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bc39d740f5af618d67fa7f05627023b2/45346927325.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c426d5106ba249f0ad0f73d572e7251b/gapakexu.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/851551bacfce02c874b0f37fa2dc72e2/62269713948.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d4c9c94b---29927346792.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1c29b46883fd27bf3a20593c934d18a5/11329424187.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed58.bin
c67817c5ef3bb866bfa7f8d91caf33bda792918071398b8b6c6498df584aa7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 5996 bytes
font_01_sfnt_off000101eb.bin
5bdd3dca25960bcec35dda35ad3c38347e52dd19aa7e5c4da452c28393084897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 11184 bytes

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