Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ee29d098164412…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d60f9bcee4fa4004892b7db4c03799a SHA-1: adeadbe5cbe3953de98409142ce624394a9486f2 SHA-256: 67ee29d098164412e759582b657231c5d252bf4969e6744ea3f6c2ac96ee1c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=lithotripsy+machine+pdf PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p80ntdbf649k3j38kio0vn91h7/34748224864.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/429416c6078c192699c87540ed5d52a5/65842133557.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/satatojizewiguv.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/61212924fa3fe87ec8196f339270ec63/lonoferej.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/93109094437.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70gr0hbq7j75gmekfvd9qhnpf/xilapigaxi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c150fcef0dc---mexalenijotudit.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/dinaxilejorarunotedoji.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adff54e20fa---30383382811.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/mulosugok.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/2225898385.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/boxokexesonunubugusiduv.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080f25f93cec---11365502714.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/75430673314.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2bb684ca9e4114fd8992085686a15e4d/12968201301.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/xoneba.pdfIn PDF document text
    • https://silga.ca/userfiles/file/63420706004.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/tutubumapilikulewul.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/78050674122.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084407a2f062---71080102774.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c64724be---fivumaxegenoparuje.pdfIn PDF document text
    • https://lapiadinafelice.it/file/wedamuwuzabivawib.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/50352113960.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/66221928577.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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 10912 bytes
SHA-256: 6ab41dac62d3ccf86cfefbd432fd231eb1ed936872a4c0d317537eda2d441ff0
font_01_sfnt_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 15844 bytes
SHA-256: 4676de82268fcd702915a0d8dd1b23b6bc8eea0bfe069a17f2b75133d1931772
font_02_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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