Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6a082692577f37…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 15:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e00aea29a1e9b3cb2659f2c3600b1f5 SHA-1: 01888e60dee012816959fdf55b99714d1950b536 SHA-256: 2c6a082692577f371249f317be3e884eff8e8ec40d1fb5b6c749eb69274f5703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The primary function seems to be directing users to potentially malicious URLs for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=asterix+pdf+download+portugues
    • http://bctlorraine.org/userfiles/file/wabisupez.pdf
    • http://toonesk.com/upload/88754599692.pdf
    • https://mytopics.it/uploads/file/27815621822.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/50944221342.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210828_ADC40D9271D0588A.pdf
    • http://emailreceptionist.net/userfiles/file/80992984809.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30cb2e5766---85721312296.pdf
    • https://urology-andrology.com/userfiles/file/samabosiwad.pdf
    • http://sumosushingrill.com/uploads/files/gajemegopag.pdf
    • http://www.zaluziemalina.cz/userfiles/file/48677256461.pdf
    • http://driver-jazda.pl/upload/file/tesizasaxenutapakita.pdf
    • https://jobtiara.com/files/files/mijorefakimusagakivewu.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1c576fc7---89042819559.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726786d5d69---repinib.pdf
    • https://duvanco.be/docs/files/97419372415.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085748281919---niwelupiduxuzazikevaxa.pdf
    • http://www.vinoplaza.nl/img/upload/files/riwifeperidare.pdf
    • http://tercovci.cz/files/file/vuvigodu.pdf
    • https://dcimx.com/files/7629413854.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56769953e8---61497960770.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_off0000bfbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBD 16792 bytes
font_01_sfnt_off0000d7cf.bin
ed2d70a394d32ee637c425ee0d6ff4996b1d92ede0112e0b5a406a887af6a58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 17720 bytes
font_02_sfnt_off0001068e.bin
1834faaefad72434fa5289228547c954bbebb923dc88f8b45d7405499d2cc066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 10940 bytes

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