Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa870ab5a6ee550…

MALICIOUS

PDF

76.3 KB Created: 2021-06-21 01:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009ab80f0ca0083fc0a072497a0c5704 SHA-1: aeb88727ae6c88aaccf5ff4cad7da7be8594cc01 SHA-256: caa870ab5a6ee550ddd553799f0b21d88c431e180d1b75ad1615c49b832d5719
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

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 http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/136a4172bf229bf04321fa101e0f0bdb/20111977887.pdf
    • http://lumieretvie.com/userfiles/file/76351885042.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9e2ef743a903bcbfe67b5eb04a59aa12/94680809896.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20d1f53823---42681049160.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/krbdakngtsebqilepit3afjuon/giviloxuboririwajija.pdf
    • http://donghozibistore.com/luutru/files/nadoterivewonabopelivuk.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/5aed51ef38a9f36014b8b20928aecd80/1598000757.pdf
    • http://msslink.ru/userfiles/files/bevumetati.pdf
    • http://www.allatpatikapecs.hu/images/file/pazitotizegaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4d9089e9---77691870770.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bc884da259e---wevatifomunazejogijoju.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1b465efe---2671113234.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/263cfae1caaee1019cc55b37a9aad1de/45928734529.pdf
    • http://abimobiliare.pl/pliki/File/gedejebidoxarakozajut.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1c7be40833bdbd35da5158da71859e52/5007095189.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6ab56b52---98074622302.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=archicad+for+mac+torrent
    • 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_off0000eaad.bin
c66fb9727a83366663a2cb3355cf4f2226daa8f98edaee76c1982c7da65789d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 5040 bytes
font_01_sfnt_off0000fbab.bin
8bd8fa0706698dfc2e79aa8ee056a4cd54feac2c14c10ff341ac28ac9d10bfca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 12480 bytes

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