Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e004d341bea942e…

MALICIOUS

PDF

96.9 KB Created: 2021-09-19 09:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 888039323d6ece304f7a2770a0368c7a SHA-1: 7094b8b72ede41ef66c9a03c761643acc1299321 SHA-256: 2e004d341bea942e003609e7e237673a75240db77a6c6ad69d22c71359437917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://synerhu.ru/uplcv?utm_term=how+to+change+pdf+print+size PDF link annotation
    • https://rockeit.com/userfiles/file/woxikuvepojulomegef.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03bd33c69---depogexezew.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/9188596913.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/puxofetatiliminoxa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f295c0b8ac---tamije.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/37505995634.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109031934236903.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/14537521822.pdfIn PDF document text
    • http://chikatere.com/Upload/files/sisoxasufuga.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/78228961628.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/zobusawizaliwesago.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/30224867667.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/34079043750.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16306379231342144055.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pui0k3njd8ogn193imjvofrekg/xaribi.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/pexasuboloxidoporegubura.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sulegepijoloziwepunigu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/45250125182.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/13626631370.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/fojomiwadokip.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/jenufedatokezab.pdfIn PDF document text
    • http://sivam.pl/files/file/vexusu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e3612f98d515d110c73c67c24c22dbc8/18321293998.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/96497534815.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/rofevegezelugafuwavajug.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/gamibijosinolez.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4be64e9b---5487461435.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_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 18420 bytes
SHA-256: b77e67f453586650cd09ea01d714ecce78bfd0267b996bf48acf81cfc3244185
font_01_sfnt_off00014486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9D 10988 bytes
SHA-256: 0c9b6248a06111f10405b3f232570a4b65576293907f4a6b2c20fa4aea83407f