Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b51bc44f579d17e…

MALICIOUS

PDF

128.8 KB Created: 2021-06-26 04:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 180ed60c784ffa2d507cfcb15aa92cc3 SHA-1: 632ff7e894c3202d60fe3c78423f99d1f0a1504c SHA-256: 4b51bc44f579d17edb717f262542c8b584b64501e7a444a2342b6fa8a68bd6d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92174508d---9451662049.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66a756f7e---serunuzeritalob.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f91f6b025---605942851.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5e3dcf1c---waxikewifaxidemoke.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0mn9ua15drgbnl7rj13tmvuhp/kidolumivaregejamajilili.pdf
    • http://gptools.net/userfiles/file/95103958133.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/04db89f770d97208009ae877b7639a57/lafega.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/acd9b95eub1g5i240cs7tr3kp2/83979636023.pdf
    • http://www.cavice.fi/tiedostot/files/46759272060.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5ff962f34d75b7042c74c54650202e57/gapaxatedufovijorerubivuv.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/71404196691.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4472057bc0221a9291add4db8395b18c/gilefuxox.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0427a1de6---92163765986.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/18fef9fb344fe07592e2d2fe1caa5565/27024108648.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/garowaxijupajiwiju.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b0c58e9d---lakiwexevakotojejurojunab.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cb7c4413da19fc63510d74be8faf44b2/jusaw.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/jedug.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a047a4653d0---73810317840.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32bdb93447---punufuloxukoden.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6953952876---30684887048.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5533eac52e---bitegibeluj.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7m71gtuu8l04hi6ino44j8f43f/86677337813.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d0s45jkjpta6nolehjblqno9e6/25443923694.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=abiotic+components+of+coral+reef
    • 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_off00019084.bin
6cf28392a668e1784feeb852fe3dbcda3aae2420f521494a053aa6a490a7efcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19084 10760 bytes
font_01_sfnt_off0001a906.bin
c6341922478dbf75f7d6777d4e8e1b142b2f39c4e8d656f9fd12c2e892c72d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A906 19748 bytes
font_02_sfnt_off0001dd0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD0F 16792 bytes

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