Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2cf1b1a79b8aa6…

MALICIOUS

PDF

100.5 KB Created: 2021-07-01 11:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd113dc8f14f975b0b0a1e1c5b8bf0bf SHA-1: c30bc7325479951c8be2664387ba381f49019817 SHA-256: cd2cf1b1a79b8aa6556db81d7b992ce7532aaf1a1b68f9db679bded1577c2bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://queure.ru/uplcv?utm_term=determiners+exercises+for+class+7+with+answers PDF link annotation
    • http://musorcentrum.hu/files/article/file/wilobafivevinefekatiwugi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd65aa3bfde---kosawotubebe.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5abcu1h4mal6tj5qundhbuem3v/95277844365.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ce907k3afptkupc8d0e241b274/penajibegamol.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/38173273120.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/722ebcbd7765c1bae6af37271be79aa6/57142910347.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ab7201349d7fe8df45f0bd0dbb8ed3de/rotalizolipomaboki.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/nomusubaloxupakisaviz.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/devinoxuxezevotunexotif.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/jisode.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc23a8f346---47875004466.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c62fa7e6896---pezuvozuj.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/63854580860.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/45611961362.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/898d4eee047c40102daf4f7c10d10081/35054304921.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/aaqjks2hue4gjrdtpjct2qpqoc/pizuzimu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fa573a391---52747372325.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a4ed167fa---23031614279.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d171773114---latofijubatedemox.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c6a78787c---pejuwomezevizadevepukozu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ce1e759c---77036270422.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c119cf6a---60694410306.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/lixenawilosavexivabitel.pdfIn 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://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_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 18332 bytes
SHA-256: aefb7261599f2cbbf142045f97ca69a42fcd262968a8af8f9ad7394a89ad1760
font_01_sfnt_off000153c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C5 10840 bytes
SHA-256: 1c759583b4b506211afb1cdfac5086021dfa4d8187b1f0fb43c88599168f9ce7
font_02_sfnt_off00016cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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