Malicious PDF — malware analysis report

Static analysis result for SHA-256 6061db741169a939…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 02:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 189d1f2200ee3352312a57bb83fd5c2d SHA-1: 4493151a799adfe6014889347c50a82560c01cf8 SHA-256: 6061db741169a9398e58192f5bf61dd3a99bde812ec28f5bc0e0adf3a68c2f63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=pdf+to+excel+converter+software PDF link annotation
    • http://harckocsik.hu/userfiles/file/mekad.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/roxudofularedi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/mugimuxa.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/fixutidibif.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/22156031377.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/52108230326.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/gupitox.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/3298889433.pdfIn PDF document text
    • http://web68s.com/upload/files/79205957344.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/litijupanabatarepilow.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6d779a711032b0f864aaa694f27579d6/57102880501.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/povasup.pdfIn PDF document text
    • https://ottopianos.nl/files/25764850642.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/55941891978.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/92399005560.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1f3971a6---sitomamusutiv.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/wajikerelanelezo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/85044121651.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8a59b64b---13497871694.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/deludujetu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/jopev.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/31245986179.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b90e53691bbef78fe78091504e1591ad/jaxujapuwulupas.pdfIn PDF document text
    • http://aven.su/userfiles/file/44826269264.pdfIn PDF document text
    • http://www.polni.si/Images/files/nanavi.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/nuzufitafogifib.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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 17848 bytes
SHA-256: d72e05715c87225b6eca59c6ca12591890b3d070e3c8cc737e0ef37eb94db226
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 10632 bytes
SHA-256: 59ed0d86de8baa0d35119842479072c3283e79d471dafdae343a0df20b8cfbdb

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