Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf507ee1bc98466…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 01:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1acc07d1961cc7bdaf5c34e03f9a491b SHA-1: 09768c118c9a25cff18529eb891dbea646e51237 SHA-256: 5cf507ee1bc984665029d73b8bb49052df2bb11d80c402e2fa3817d7f69cb23a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack vector being spearphishing via attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=job+confirmation+letter+sample+from+employer PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d336c0d5b---6252245201.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/39855744137.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/219aaf3d8a3c1615e4c14252ea094956/fakolelesemunera.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d604c712d8---98781573680.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb27d74f81---kuzosojoxivikukivokow.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e50aab26f2cdcfd43a7d91ca020e6326/55225093228.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/muwedunegavadej.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dee106217---46851994732.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/de3deed004dd9fecb1da22c84cc248e9/velezukosejale.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0aadef96---22693182564.pdfIn PDF document text
    • http://amajyuku.com/files/files/lefagefafevep.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/xezowisivorabuw.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/welumir.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/47983847502.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fc07a1d12f33a89e418124781bad7b63/losuputux.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/f2hnn0j8t69409s5a741hhbf6s/46147060377.pdfIn PDF document text
    • http://garderoba.sk/images/_file/bipovese.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/db29307ffaa91d0b6d45f645848542b3/nijewav.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba912ce64e5---18903255982.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ecebdb68---30024654013.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/49150a3f3e94b68e3976deff2f0e3bd9/70354826976.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160756143543a4---suwolovapabatatarafivoka.pdfIn PDF document text
    • https://epiphanych.com/images/file/buxugilut.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/soluxinufikasaxezusi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c1bcd20c925c2846c862e414304b3fb9/4832792068.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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 10888 bytes
SHA-256: 817dd75998971874ec07f38697bd0223f32ecdcc53a194a0163958940068b968
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 16908 bytes
SHA-256: e956c104244179a60859413327ddfa9e0cff616799bf68691ba8284c8d97e430

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