Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dcd67232fdb93c…

MALICIOUS

PDF

79.6 KB Created: 2021-07-16 14:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1aacfb5e264bad4a58552d4d470c90e SHA-1: aa6de658ddecd193993cd2117f179e24e7d14651 SHA-256: 94dcd67232fdb93c5061d3a04cdaa24f71a52dd53a9e0854b3210b5e568227c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting further malicious PDFs. This indicates a link farm designed to redirect users to potentially harmful content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/sd1350vrito743a8vbehjuj0ou/74271752811.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/19940910537.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kkiqr09pa0rme8j6he058buah4/62939043853.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36b0a334d---bexit.pdf
    • https://aduanaldelvalle.com/userfiles/file/webepuwukakikuzemu.pdf
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/vusagudexew.pdf
    • http://china-engine.net/ckfinder/userfiles/files/vibutul.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/03a0f5a6f50436a9452efcf4ad11501e/95913780948.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081bdab02c21---wozofuwipikorixazogakawip.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbb3ec8f2---2173676942.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/db448f6b6df0e4da8967da584599d6c3/72239876905.pdf
    • http://fsgpj.com/upfolder/e/files/20210628103337.pdf
    • https://travelsafeway.com/userfiles/file/doveru.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ma6igeeltc37qq8t9bfsa88qlq/2667051343.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c158a90---ligoxonezatero.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758ff2f3df---51879854255.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a41e1ccb94---sadegukoxutomibukizifima.pdf
    • http://www.hydro-tg.pro/upload/file/41217212119.pdf
    • http://proreferee.ru/uploads/ckfinder/files/dupafu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a58cc1fe9---39576506103.pdf
    • http://spc1991.com/ckfinder/userfiles/files/zadolikodavojojetetu.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4ea71a44---xibawada.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7b1064625d676384ce913ada669d7ad8/45037383646.pdf
    • http://rana-international.com/userfiles/files/5241399576.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tall+tales+bait+and+tackle
    • 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_off0000d39f.bin
8a1ae205e27b537c1f504036d023e407629bcca3dede3060fdc37a827d485f05
pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 17528 bytes
font_01_sfnt_off0001016a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 16792 bytes
font_02_sfnt_off00011981.bin
da5e4b356190bdbdd848a4a970d8d60823c1e310dd4c92260020aa1ed5a0045d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 10340 bytes