Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7b6111fc68e5d6…

MALICIOUS

PDF

100.0 KB Created: 2021-09-01 16:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 348cc1a3e0fb6424965c556533a9fdd1 SHA-1: a2bf659fb46dec32a426c0d5dcb4993c6da1535e SHA-256: ec7b6111fc68e5d6692a25f0e107972846ae4e72b96d7899a6989f4626af6851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of link farms and compromised hosting points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://wastran.ru/uplcv?utm_term=mechanics+of+solids+problems+and+solutions+pdf PDF link annotation
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ppnuqjdipmk22imolg4rs62t97/pulowilawep.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lodaxaxajag.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/36156756813.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/32514011930.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/67543759808.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef92a3296b---zuxurokisupofuma.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/vigigixudenejes.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/70518310149.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1vogu7c418o723mrtd41kktv12/8140689354.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/58241ca0b9823b1c6d5040a270440c30/10416156886.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/77ca195454e6f6b608b9d87442d52aa2/48398179259.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160928076f0a62---91975482879.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75604083877.pdfIn PDF document text
    • http://irinabailey.com/upload/files/bebizapu.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/35113556574.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6ed17767c---rusirisojekanuna.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/negumasidirevegofod.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7511919f91---xilaxosokipigomewotuka.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/50971846520.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ae0fdf55ubdgj24rdu910eh0j0/78627383064.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e1854d86---bewuxevofedupowade.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/gavipivokobebapav.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f443d326a62---nulivebepubus.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/13569909674.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/61013944561.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_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 11120 bytes
SHA-256: 5cd0af1ef2614dd3243d789d621217fe8d6d4620a64694386391979ce03f0520
font_01_sfnt_off00013997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 18116 bytes
SHA-256: e8de971f35e0f2e3131d34f6c9746544e0e627d51ecde54a505176c63de6fc10
font_02_sfnt_off00016915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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