Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef49462f30219358…

MALICIOUS

PDF

88.8 KB Created: 2021-06-22 16:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 776271fb3410e50d7d502bb4ee579d3f SHA-1: f05d6e0b550180838cdd1b4d717f8afd7f97a6bd SHA-256: ef49462f30219358426670269f0b0415cc50072b9e7981fa48c05e05c32f5b52
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are hosted on compromised WordPress sites and utilize UTM parameters, suggesting a link farm designed to attract users searching for software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://chcial.ru/uplcv?utm_term=download+autocad+2016+portable PDF link annotation
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/le4q0q488pgu0oftacfd5l6io2/16619724998.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0ad8379af98ad390c3c6753f12f5a8c2/5044702957.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vetotowod.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/nivegofitiziru.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6949096bbed9cd6e27e44a416d595735/pibado.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d178628df1---75810298589.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/70634049856.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/birizasolon.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b79b4dca060b9dcb3e320fee26d9a35a/14457486747.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7c504bb9---30715325789.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/u1sn39dajtfg3jn3r6v6m4ahlq/tufet.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070be985009f---28822440861.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090947214d04---34547863143.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4tu513hm7ot3luekfskk3fq4m3/71687000084.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8c651d6e---65656181045.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d8d8efdca1edb8fddf06d6b05d756a39/zosetuvuf.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/9385902575.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebdf924ee8---bodelinebokaxomized.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/38405330646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 5436 bytes
SHA-256: 5794fd356aa59ecf36a952322b098037031121fa3ffc511755e3a62251935eb6
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 15400 bytes
SHA-256: 8186b8c5e7f0ba59618433de6812201ce9b9f8ed68ee755d1c98da74494f3162
font_02_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 16332 bytes
SHA-256: fdceac8a2fb183cb8cb66688297119e161becc45ff9edc29bb2ca7b6eecb76c5
font_03_sfnt_off0001457a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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