Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dad839af2e6425…

MALICIOUS

PDF

128.7 KB Created: 2021-06-30 17:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 876dfca2425ad06c9744e38d33f159d1 SHA-1: e39bb3dbbdc889c4839295872f621942d740a8e8 SHA-256: 45dad839af2e6425392f72eeec07912fbe6507a2bb0f236862708375b2f90efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to potentially malicious or compromised external sites.

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 https://searchlink.org/userfiles//file/fomelekasubizijusokijik.pdf
    • https://rjpexport.com/files/kuzopuligiwonuvudu.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf1c6646c---zatakaxekum.pdf
    • http://transcash.com/ci/userfiles/files/53857850242.pdf
    • http://yuha.be/_files/file/susogejesagujobovixaj.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c08ac5dde1a---63793726048.pdf
    • https://ka-base.no/images_content/file/gakitunid.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c748b839d06424b258789bc6da6e9adb/jidofawamorip.pdf
    • https://anmoul.com/userfiles/file/85827522062.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca445d651c---zikur.pdf
    • https://contabil-fiscal.ro/mm/file/robuwadosebirixamibekipa.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3c18c7b89a67dd01eb771fedf2de0a92/8328914175.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a618b58c991086388e5086e58ef81c98/xezorodozelomemojoduvo.pdf
    • https://tiguan-wiki.ru/file/zefakunafo.pdf
    • http://alisawedding.com/upload/users/files/vabifuwefagunaxalule.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c895ae1a962e2181de334d0112701f4/biduwitigelife.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/xuwutekisebazamelobubatu.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/386aknrujo39420086gv6rs0e2/jaxodevowuvupubexom.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7eff178a0a2e4538ebb2c1027ea8dba9/67312029469.pdf
    • https://icbacademy.com/upload/files/9191779372.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc5cb4ce8---zenulogovugipejizu.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2c719ab4ac1fe46a42330df9db291336/62756240199.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/134e05b06cd2db65993748ee1eb7e4f6/fewamodolazivamabor.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be9486c19---71793159612.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f76b942c---86920314825.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=trade+sanctions+meaning
    • 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_off00019732.bin
e942579cfe5a7f4be5b9a1e697fddad06db7b8df2039ad561b23e5691e899751
pdf-font-stream PDF embedded font (sfnt) at offset 0x19732 17616 bytes
font_01_sfnt_off0001c514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C514 16792 bytes
font_02_sfnt_off0001dd2b.bin
f3c2daa7cac816f7936ae484a39ed7afebdb6bfbf7c6dc9dd4fbf0394b7fcc5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD2B 10628 bytes