Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c28674c1a8b6b54…

MALICIOUS

PDF

97.3 KB Created: 2021-07-13 23:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5df7afd5f1afc9529a623dd2e9a66b97 SHA-1: daaef52443f42cceaea3b728545e7d4dc1f89ff0 SHA-256: 9c28674c1a8b6b5479c833920b5d3ca6cbbb8fc5d91157eeb03d1a2e7b6666d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lure users into clicking links that could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=network+layer+services+in+computer+networks PDF link annotation
    • http://ping-property.com/user_img/files/tazefaxoxobogixomariz.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lubovixarigujeposidij.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961e7d6db0c---89843597144.pdfIn PDF document text
    • https://viettrungson.com/media//Files/14567636701.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a134ff7ab15---fudotomon.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fbb66077366217a6331430cc6145507/6560778219.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/56c5210185c64135560e530fb76ec651/vezolaxulololeni.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b733923f---57637618154.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/707a1f00f33694fbe6ea4398cb38a067/56392414839.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d310c31627e---85667198833.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/97650659000.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/91360509746.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/2abc891a152dafb3aafa022c079a2776/67682972944.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/63123227754.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bulesogavexizafesuvatef.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a64aa9d764fbe029d97f01fa300610b3/76030583408.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/tezavojudatifek.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/84342955631.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ff8c09a31005ba2884622759d93778de/fekidodi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c78004876---99878193876.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa3cd26ef---85989667642.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac69960188---fijimus.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa05eb72dc---pobofokufejaranosimolo.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_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 10972 bytes
SHA-256: b8969c3560b4397d3df16604a03275dcabab7e64d7283ec7721a23c7a6b9a8b0
font_01_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 17080 bytes
SHA-256: abb96dfe9b6c002cc9e0d5c8b3a219e7ed124a9c380c93708854c87e7a330274
font_02_sfnt_off00015fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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