Malicious PDF — malware analysis report

Static analysis result for SHA-256 537a614796f2af37…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 23:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34a021dde8611aa8642574df512a51f4 SHA-1: 68b83ae624ffa66c8925aa61bd787e28f597b86e SHA-256: 537a614796f2af37fc3702ebc39e63eb61d6fc268014d5407ef2a02250cfebbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe5ef29f1---33811601141.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56232c1a1---90722283663.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/88114119840.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/6795243381.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/34454426480.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/347164235.pdfIn PDF document text
    • http://jar-ted.pl/file/xumewin.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/68940958372.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/47458051981.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0d97f08a6---46631176217.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/67618517755.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/76e34abf0cf2a54a4aaf3d5aa7ea546a/daloxomawijepukikuzeko.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/lfut3lkt1qati5350104gtl2pi/rarure.pdfIn PDF document text
    • https://actor-conseil.com/files/file/fipupub.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/33119587152.pdfIn PDF document text
    • http://guowangcable.com/d/files/bebufolutizisure.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/15776639619.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/zudusurufu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612cef7595839---68062027613.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/rirofitinaf.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dowimuvunubudubib.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/52696354329.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b6e994eb2---rufedivovawajiden.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee1333227---pakepubibakufawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=brewers+schedule+2018+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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 17460 bytes
SHA-256: 6ebbdd2d0f04d2aeecaecb3d6eb88a55f8dc3ea25521a170f8696e774b520eeb
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 10884 bytes
SHA-256: 2d22da66dee7318cd826f25faa96de7b15a2ba45dac44fc259a28acfce7d508d

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