Malicious PDF — malware analysis report

Static analysis result for SHA-256 9827c0eb9ec0d206…

MALICIOUS

PDF

83.3 KB Created: 2021-06-12 12:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 875c7d9b5601d32ce163c5e45ffad6c3 SHA-1: 084cb238d6921d412da9848d14ec10abe39c87bb SHA-256: 9827c0eb9ec0d20676799f891cc1e371e8e92f1bb4554fef26d837b9a964dd5a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. No scripts were extracted, but the presence of numerous URLs points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=customer+model+canvas
    • http://tutek.eu/userfiles/file/rufoxovifu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4cmnbtqkmh8gt6r3pfte20eqgi/5788276354.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70a237233f---70997089622.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ir4csmj41dghsu2v5c24it5u4q/29300835771.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38927a0c9---nosebugilinedu.pdf
    • http://peaceinsrilanka.lk/userfiles/file/nazipijedogudorifow.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685a4621a0---puferu.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/no8aii0v7okk8a0d2k7tbtb32o/wodesupetaxefimegajosigop.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bd507321efd---26166606143.pdf
    • https://studiovizia.com/webroot/img/content/files/xotuvevokulotemudiji.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080da7d05fc4---43460471602.pdf
    • http://apexibd.com/uploads/fck_uploads/file/37250476126.pdf
    • http://jfac.kr/ckfinder/userfiles/files/99017852347.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/4064375387.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nufixagawibul.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22983d9890---69167154134.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e7836f2d---ribirowebuzonesobij.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_off00010841.bin
e05fb09892caf4748d7da1355528d7c55ee71e5bb87445368be1f0a76c320a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 5048 bytes
font_01_sfnt_off00011953.bin
a4161a41cc8a5350912db183fb4ac8f572ba313c9c0ee861f8d8dccbae587879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 11312 bytes

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