Malicious PDF — malware analysis report

Static analysis result for SHA-256 1544ec359abe9159…

MALICIOUS

PDF

82.4 KB Created: 2021-08-10 19:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e57c4c9d59188e667a7a6f62cb71b63 SHA-1: 6267ebe7c3de58b900e2f07fe13f95f184089bdb SHA-256: 1544ec359abe9159cdf2b9814e5d3349b321f243c20e3a12678ae1b139d64983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised WordPress upload directories, which in turn host other PDF files. This suggests a multi-stage distribution or phishing campaign designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://coretry.ru/uplcv?utm_term=check+list+de+inspeccion+diaria+de+vehiculos PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • http://millecolori.it/images/file/waberuteburozo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608762b35c768---29649979292.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/vibofapukalopipofovatir.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/77363412548.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4a2d068e---57891767983.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/dca78bce47f8c569c4d96cd2de2cfbed/63494201809.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/lbfmpsmq5rmirevqaenqkhovfm/tonodu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/10731944707.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/xopurevumejofes.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/43536351642.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9dfc4e7308---14816461690.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/57410739021.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/94931296948.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/69276384065.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ee08c191---38394163914.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/2967342602.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f681213e9---fusagofakiloruxevanivuj.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc06b2e474---83987415627.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/jusitigilarela.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fuzekejudi.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/jugunekukusatibep.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5b5298b5c76ba2ff3b977513c5591b3c/17413654843.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/54eicgnvg7q3oa35rdtu60hqto/gelabufasefafozedumeke.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/zupekogodobusaxugaguw.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/40076589188.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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 10900 bytes
SHA-256: fc4f266c7d4c65d62d3c5cdcdb424ff6c84451738de8c3139d3832e8381ee450
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 17860 bytes
SHA-256: 6be615efdf17ffd0338288cd90767b15c8ff1fe940666c1c65be68d31c3d5db2