Malicious PDF — malware analysis report

Static analysis result for SHA-256 902a29f91e54d21d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 04:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7de7f8fef36dc7fb0f4a199a680f8ee8 SHA-1: 676c99b2c00bdb2a8f8fddecd2a9641191494cb6 SHA-256: 902a29f91e54d21d7e2497d7a1d863ca0c14c9ecf41537e0e88476d03131c11c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is likely intended to redirect users to malicious content.

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://drafthe.ru/uplcv?utm_term=sentence+and+phrase+worksheet+for+grade+2+pdf PDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2537b37e---42741816089.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/26321769712.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210704071957_efnw2s.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/85926809026.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f8e53ad4c---fagukexaxoxezinebeni.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/sunosadidowoxipavufiki.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78b0bea108dd60c11a66000cef532090/voruwiwikifozinewamobina.pdfIn PDF document text
    • https://hsse.cl/files/seberidobazopananusewup.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd32b2369---rojuxelajulosoweda.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/56179376959.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/19453234288.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad74695a6---zexigofenukoxun.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/46859774031.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1b2b19f9---wudejakiseposasamefepoz.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/65390731761.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/voxazulinumajavu.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/xokuxosida.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/888568176e8bf2bf50c5cc613ccbd0e1/wepexorogokaloze.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/56ca0d1b3122d2ea2d35eb669607bf77/40964970745.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/37188615978.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/88029686656.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5e1aa831---jurakitimaxodalur.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tidefofilijosekoxuw.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/gooht9d5veq132j4f8ftskndrf/20587053314.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_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 11132 bytes
SHA-256: 153eec7e6e600c84269014bf7fecc4203fe294249e4e1e848a66ce7f1cac19e3
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 17160 bytes
SHA-256: be41277981408e087b3817331a3fef3e92b7c0b29592e5e23e5cc6f78fec7ff9
font_02_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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