Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cecc2d111a4c85…

MALICIOUS

PDF

75.2 KB Created: 2021-06-13 18:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: df4bc49c1130be3a2fe992d08c809f39 SHA-1: 89751f5a9aefdf2d8ff9581b3871e2288d9378cf SHA-256: 43cecc2d111a4c8552acaffc81133c0f71dc9936479ee84c6bcbf1e0745be31b
156 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the overall structure point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware distribution.

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://pixomot.ru/uplcv?utm_term=personal+loan+statement+template PDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2b799b8d---zogomur.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cac2fbfb---76205898550.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae5773343---mepakikadefopomi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d6679703---faxilidaleturojo.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/mumuxubamogejevizakone.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848c63573b5---sanamere.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zeminarumotimuzanexe.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8253c0fc0ea89059d1484f559a0fee1/98968127627.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c7e6c06c---xuniw.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e83322dea---90008520343.pdfIn PDF document text
    • https://naoshima-habitant.com/xenew.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/letegejonajitorolazina.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/30c14910d973adf4df8396dbd9219a90/13860282200.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3823cb397feec809c1da4fc55a8eeeab/vifeme.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/201a6a4ffd498384b79d425e8d803c77/givofugoturofozamur.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/14060729487.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/74908134482.pdfIn PDF document text
    • http://dentherapia.hu/files/file/15858191188.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/fivezozawozosulawes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 4968 bytes
SHA-256: 7094a53f440d7c41a028f1e10891f8e31fd60141de7813fe8b6ccc4832fbf62c
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 11272 bytes
SHA-256: 09d1547210aeff8996c653908d1662624ea65ce1d15bc249fba9a897159f28cc