Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d085591a5b0da9…

MALICIOUS

PDF

72.8 KB Created: 2021-06-19 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2014948e32f08da3d1e0fa6cb12b05f1 SHA-1: 04caeddf7a7df472b20ec6c82d3b6111d2923311 SHA-256: 16d085591a5b0da953d0047645c623e04f1e952416190f8c21a207f179d05835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to exploit users seeking specific content, such as music downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=dawit+tsige+music+download+mp3
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4510e64f---fugik.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ad16fb6b---rekuzipokisapakiwalegafe.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3a1889cfd144424a7ce4da2d420d9c3b/dazomuxadesajolopux.pdf
    • http://jfac.kr/ckfinder/userfiles/files/jedofikiponopavulizox.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24048cb9973c9dc02bc6b32f5e8f396a/dudevifajifitewowotaketa.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1749b3f5---57625897109.pdf
    • http://appartenvue.net/appart/upload/images/wufed.pdf
    • https://thietbivesinhanhhuy.com/asset/files/87672286097.pdf
    • http://posekatzahradu.cz/files/file/baletuzezubi.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/646ab27372633c4be0a233e120d29cc3/paxajin.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/suvedesunesag.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d692136b4a---verefe.pdf
    • https://rowadalbyt.com/userfiles/files/93605780631.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ec260d4b---fefagoruvapiniga.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/dos6m1207pn3f2hf3m3a0r7e63/gapujojipuxuxusudewu.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_off0000dc81.bin
4f6621c08b2dc0ae220bdbca2d2841b8cbbe44fc42d8acf27cb0669ca98295ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 5552 bytes
font_01_sfnt_off0000ef75.bin
5b1ed13a003700dc0fe20e76eb0be798c2051bc53f36d76b9a4330d37bddb426		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 11488 bytes

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