Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddb3fee870c3e74…

MALICIOUS

PDF

76.7 KB Created: 2021-07-04 07:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea2669710ba6990cf01058f20c8a5471 SHA-1: 8ba202dba9b6385f01a1850ad8880c81b2ac97e1 SHA-256: cddb3fee870c3e74479f946346db42a689b2e22053b1bcbbebe37338d7ece97d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating it functions as a link farm. Heuristics and ClamAV detection confirm its malicious nature, likely serving as a lure to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garglob.ru/uplcv?utm_term=discernment+in+the+bible+examples
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bes231jc22dnlmuhdhpl7ohig6/80213370823.pdf
    • http://mamnonlittlesun.com/upload/files/kipatufologipona.pdf
    • http://esrafisek.com/images_upload/files/36590746640.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bed3e9743---zasarupoforikonodegum.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc628b44764---98036155292.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hofqhbnslq6lkbn3g6t70vl86q/84840904877.pdf
    • http://bogelaipigeon.com/upload/file/41403357342.pdf
    • https://obermeyer-modemarkt.de/upload/file/nijelajesa.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0dfeec8f---zadidinemis.pdf
    • https://okinawa4d.com/contents//files/6837860794.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/73960287733.pdf
    • http://jeyadhurgatemple.com/userfiles/file/muvufufopazowolidesuvolu.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0f8d3c26---78223553226.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/90039043891.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c624d5e9d68d270f8552a4591ef09c8b/64844336464.pdf
    • https://powermailer.in/userfiles/file/fikebizogepo.pdf
    • http://villapellegrino.it/userfiles/files/6101959866.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rimuqomsg4pvgos3fvbp0e8i91/42215502039.pdf
    • http://poltinik.ru/userfiles/file/3523782655.pdf
    • https://bititechnika.com/uploads/file/52105863139.pdf
    • https://adasms.fr/userfiles/file/virenin.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42959be38---topof.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/63045691341.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd19e9730---54383932263.pdf
    • http://auxerretv.com/content/public/file/13582854319.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd86f4f094---80188440898.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 16792 bytes
font_01_sfnt_off0000dfd5.bin
7e7f0917fddc8fcf6c31ef6245b719667f34647371df7698460bc79c2d9b0a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 17636 bytes
font_02_sfnt_off00010d0b.bin
1e986a8e0a6e59a1a1ed0bc9527d4a34375646b4d29fd5a32ab627f611960d46
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 10760 bytes