Malicious PDF — malware analysis report

Static analysis result for SHA-256 7911d8297ced05bb…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 07:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 59cedc230f3c470b27516f3258309b18 SHA-1: a09d59db7827e6e5567e1f642e80cf264734a053 SHA-256: 7911d8297ced05bb034425a6eaf7caf146627deecb15a3b905100a731c7c216a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially malicious websites.

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=which+takes+out+more+taxes+single+or+head+of+household PDF link annotation
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af96aaee120---tisuketidepomojezedoxu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8f67f26dfaee3c2382e64e4222f1d388/20047967844.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080959eb823d---faxavirevezagubebi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e053e2b1ddcd2b1e54b6c8aba46a29/54699948556.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086de8dd91d4---bilawofulalilinowub.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/xoramasije.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/62762993397.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160778fa870df4---84509251936.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9ncc50i6q61bvrc8ss101pkqrf/forewolomadibigitu.pdfIn PDF document text
    • https://ekransamara.ru/files/doxedadibakufonemaga.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/48462529204.pdfIn PDF document text
    • https://daismene.it/file/puzodezatipenaxepirevit.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/73411649297.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/71545997769.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609586afa6b38---82113167835.pdfIn PDF document text
    • https://purefeeling8.com/data/file/peseropo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c360dbf3cb---63782952918.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fa720b745d951cde68dd2c8d221a8973/xejonovadenebekal.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/94809136780.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b037e64e45---sarevinaralidupesawegumi.pdfIn PDF document text
    • https://hsse.cl/files/1395798292.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/87b2d163467b8e4fe17ea4a4d4193fd2/gebakuwepijubexubaxor.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/38176968210.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pasinuvidajomibava.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16070074fccdf4---38540067344.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_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 17964 bytes
SHA-256: 61595aafe9b462d4bba941854c40226e498f23709145ed536bde9f737f2e1200
font_01_sfnt_off00012d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 11208 bytes
SHA-256: ad249b9c4dc85b953dc41337b5b7618f71503fd819106fdef62e4c77e14f7281