Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e873d06d10411c9…

MALICIOUS

PDF

89.5 KB Created: 2021-08-03 04:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f745e40b911da61602f4e5ccbbcc8c31 SHA-1: a883c1d5fb4abc62b5bbff8e164e9fe517f7897e SHA-256: 8e873d06d10411c967ba5843a8b6ca6b4a34a412c5ca7c6e83449b2bd675c1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. The document contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing attempt that likely leverages embedded JavaScript or exploits to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d33657c84b93ee20f9cd7bf6af68b26b/vileditediruk.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610891431c871---27208125010.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/besupegifuzuk.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/lanamupixuferu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cbf6734b1---95960066235.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b44a0094d0aa89dcd6cf73c964938bab/biresew.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160771d1f6d746---39303496018.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fafe8df3acb---kanoluzat.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/bibifigimajijuwosewoxusov.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/kufonav.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9e57cce23dc14121979e42e0dad12d61/revinozavo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16095e71f70f99---22541306627.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2aad65698b185ea37b8db5ac3efca927/31128531198.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/gonawibusakekeresu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/19226517570.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607291f1b1299---fixem.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/61623646406.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772d3e05337---xajisoran.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b2fac80a3abae2bf028bbb2317b85506/laxiropir.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7112336cb---26855055444.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/82345286468.pdfIn PDF document text
    • http://ledson.ru/upload_picture/88780881748.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c83207fe2f0f5ade889dcba4cf0aca89/37048582618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kabali+hindi+dubbed+movie+watch+onlinePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 10752 bytes
SHA-256: ba72071cbe0676dd0da1e782927a1916fe0b0cd31223e1b12d3e2cf9a1530be0
font_01_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 17288 bytes
SHA-256: ec830d1c554af025991b6886ae9ee5eb20ec59c0ceabaeaa725cbac26fe7651f
font_02_sfnt_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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