Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d6b6a30d608c77…

MALICIOUS

PDF

86.4 KB Created: 2021-08-08 08:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c886cf250a0977cc7c9ba9aa665608c SHA-1: 30653f40ff95a4f90fecb2236321fdd564f1ba2b SHA-256: 41d6b6a30d608c772ba988a12ccc53cfc35c7f94a77ef0638e0ae7db1d654893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://edgecs.net/documents/fakudenad.pdf In PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/49334226952.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c412a896c---42954726995.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1a565f28---vozepojaxifejul.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/27266977113.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e1da392b9405dda663442ab93c9223b7/35042543150.pdfIn PDF document text
    • http://topp.pl/_topp/file/28673307447.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fogaremutozunozariwa.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/38285616481.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/bigujekeviziguvawuvik.pdfIn PDF document text
    • https://dm288.rs/slicice/file/86535882618.pdfIn PDF document text
    • http://aimara-bg.com/userfiles/file/90706647639.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/18179764389.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/wasowolapubapononusizafir.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084bda7e245e---todurukabakunur.pdfIn PDF document text
    • https://bursac.net/userfiles/file/88306383204.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/37026079872.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8dda2fd0282d5fb3bf88d3d0c987b21d/nuzifupikujunelipotat.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/52681390720.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/rebifarepifazata.pdfIn PDF document text
    • http://saydersan.com/firma/files/61874842671.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/62998660133.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/59569551282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=alfa+laval+decanter+centrifuge+manual+pdfPDF 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 10824 bytes
SHA-256: 5c11a6349680ace21f286859cab5f4bf22fe62b774359fcdf679f23fe552ad6e
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16496 bytes
SHA-256: c6a17c2fcda264b49214cb83cbd7c6e9cf8749f8ab5fb6b106edb7185469190d

Open this report in the interactive analyzer, or submit your own file for analysis.