Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0adfc991033ee6…

MALICIOUS

PDF

98.2 KB Created: 2021-06-27 12:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e35772969cfd19d2cf6c7cfea5a472ed SHA-1: 2b4c1eca9ca4022ea182a29c8e856747576560be SHA-256: 5a0adfc991033ee69e7fcc59857b7dd502aa5f997552e134c24d0b762969b5f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://crewmak.ru/uplcv?utm_term=how+to+do+apa+citation+in+powerpoint
    • http://goldenpeak.it/userfiles/files/37113078638.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66a88cdb1---vonologixevufifutuvogaxu.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089afbb14214---bujakiledebomemafemoxep.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18c1c89af---vexowifivoxonagarebak.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160998103f13dc---veraweparowabozumuvekenak.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/woziwiwar.pdf
    • http://vyveva.eu/UserFiles/File/fijimasanusefiwax.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6eaa78439---davogizokosiwimofim.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/1rhkb7o154h9mfeqjiove0jhn6/rifugexaxizosevakozeg.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9f2bj59hv9qtq5n0ufk77nlcce/29695197991.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4b3c1720eb0ecab53629bf1dd94978ab/16362559934.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6f2758e60451a1cea79706ec7b56cb1b/69710735494.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f2501d08f---bonevafovumoga.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076eebae00c6---belise.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b228472087---tokugopifokixunosuvivazib.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/53a50acd68e4408715e8e290f22ba4ca/15340930730.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160779e6a73f5c---bosavifudusomofanasukav.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f21f4da0fea06326bc1efcd2dc42772a/65551989046.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1cdc82eb---dadagexudewivodu.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/68427448434.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/41051766133.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/putezano.pdf
    • https://confetti-seasons.ru/upload/files/xigal.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e88414a8b---41157414725.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_off00011b87.bin
8d662d63f58b41f0c1768d6cc34128e53211521bc997bd0c394e39fb588b3ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 18596 bytes
font_01_sfnt_off00014be9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE9 16792 bytes
font_02_sfnt_off00016400.bin
6798aabb87c002c8016fb937ddc7b5c46fd55a7b2988bf58ad1927e0e40dc518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16400 10372 bytes

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