Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3eeef1301bb8f7f…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 13:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86ffab5f3ed15582bab335825fd0c607 SHA-1: dc73cbfb9cd0ab24a276cdac8a3b4a6448276371 SHA-256: b3eeef1301bb8f7fa3c640bdec7757c048fa5e9409431e8be5078fcc1ae42d4b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=quid+de+rerum+natura+querimur+pdf PDF link annotation
    • https://beeshark.ro/app/webroot/files/userfiles/files/65647378835.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/22726830550.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/87318036018.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/pesiruvujelan.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/xakogajidug.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/61499341583.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/sukexiwusa.pdfIn PDF document text
    • https://isosklo.cz/uploads/zutidiral.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/84265698573.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0pt4h7hnb005k0qbrsu28qf7ms/rekoligejobakegudiboruzir.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9873f6d3773ff6db214f416652e4b3f4/rupitezumalekig.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ufn30sld3ttih08rbn7ubock6/94845809309.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b83d75144e---vumej.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pojapaluwak.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/fapegoruretomuze.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa5093380---77190174959.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/morafan.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b88aa7209c3---topimesokedaxajazimumo.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/37700426700.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d985d6cc1a---96995375803.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/30571662421.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///42002676685.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608707e9d145e---29715201481.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/bibozivixavel.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_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 10628 bytes
SHA-256: a775c2514b5743308aa50ef2d6f317563ee0d6a7beeb72fe376f653eed0bfcb6
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 18036 bytes
SHA-256: b0d6ee6b2e94ab76ff501eb6f4660adfb207f0b7a8450d90c4be34d171eecaf5
font_02_sfnt_off000140f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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