Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd85a6dde69ef33e…

MALICIOUS

PDF

120.7 KB Created: 2021-07-01 14:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c67cc5100aca877784f4ff28e5915b9 SHA-1: aaae2d95b0ae4b79a836a15308a8add56e74a6f9 SHA-256: cd85a6dde69ef33ec775e185d1dfcb538abc3ce5363880f2d95d5b0a0b409e6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alternativecarrepair.com/userfiles/file/jixexovozerobevibevupilo.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493618e400---pagenivovozafem.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/037cff4e66014c2c5cda38e0215b420d/4099344615.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/86a9520b5de55ed76b1f64e8c62bbb13/webisujibozefapiselija.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cfeae36b1---lobaroxuxesutosidorazuv.pdf
    • http://zzliuxue.com/upfile/file///zuxenemufew.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5mqsgi5j4svqjecsvcq1qjhj17/xefalodujisuxu.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b0f07b96---18632554777.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/34234410812.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac2804b25---xijunejemewebedaribeg.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2091b654---zijab.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b971f7c98611cce67464b56059569b84/zepitalutimejigadepejin.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/18c1b194df13357d2209492554052475/nuwaxobonodobuwizakido.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/99ba7a1c9039aed036ebfe40cd539689/43597157599.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01c46fad2---kelaxufareso.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/d64f8127c3b9082b4157eba79360e2e8/91043715051.pdf
    • http://agrobud.net/uploaded/file/nejobarudajitubin.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ff22b675faf5757d357c21d91ca44009/xofidudozilugi.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/02fe7b340d52271d5d29f3ae3d1ac005/83122012260.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/35308911895.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cf29b506154b28ad013299169f1736b5/dewobugude.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/mejeketelowojaxuwavizina.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/nntpe3jmccbbdchoum2p3q4etn/54753833096.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03bd6985e---fakalanaxapawupakewinog.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/skogpah0g76rvk70bruv0pvoi0/89749612894.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=different+types+of+koi
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001376d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 16792 bytes
font_01_sfnt_off00014f84.bin
c1f189ed712d8245df3f06114b1ed588c9407a6486fbf805c26b93c402920094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F84 10352 bytes
font_02_sfnt_off0001670d.bin
9398f85cad6f03501cea04a48dcb18c39b512e7224c5ad5cb8ed23d1f8a57c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1670D 19976 bytes
font_03_sfnt_off0001a234.bin
16d10b244e97e42c29039fc4fb759e69d6372167cb8380a0a5cbadd3f39bb27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A234 20068 bytes

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