Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e458f11b597a8b…

MALICIOUS

PDF

92.8 KB Created: 2021-07-17 01:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5942f426e9a46fb5ba95cc86e5392bbf SHA-1: f94103412834c5bc3a533d60d80a130371fc8e35 SHA-256: 85e458f11b597a8bcbc4365bf7c7af512726b7a091640b64d179c1526b8296fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leveraging embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://textolinguisticsolutions.com/upload/editor/file/75290835090.pdf In PDF document text
    • http://dienlanhlongan.com/upload/files/pexanoguxawiluguba.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e8c8515e---29802279937.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ca0df2cb---66709400839.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b83795e217daecb1ad9a0bd862bb32fc/64768405986.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/25703575472.pdfIn PDF document text
    • http://zae.me/datafiles/file/92793387528.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/58704660537.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c01bf7a5daf718aef9eb30a3d43a100c/43472544298.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/jfameb3q7pkvln0v7qse5vde8n/75236827222.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/muzanapejuf.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/77fquhgilgbdqjrjpuu1ducfop/26872213684.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/dixerazo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gasekabutemadivajufer.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/dqi1m55iabr1hmhjpreuhsrik8/4802519781.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/57351121661.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pofawosaziderovidepusolav.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d511e30d296---xivopamemonizaliru.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/muwuvepezozapux.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/db172b78c429df1985d6d1976c0de89e/30800981447.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4m7aa4qh34b9228vjver93n0n0/zalalevadoporatox.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0204098cf---sosidefifodode.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4b31efc291bd5f95e4fdba34f92e22f5/33868510810.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/gupemipuzav.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d9e5a0ef985dd37c7183d75a136d59f2/wekase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=advantages+of+online+learning+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 10720 bytes
SHA-256: 4ba3d5ac87fb0d3bf512d9c5ebe78f4763cf38149016cf1ae2556b326c08fdbb
font_02_sfnt_off00013997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 17032 bytes
SHA-256: 987026a1d8f458fd76230d774e12aec41e84833d2fcbe0a82aa40982be590aa0

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