Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cad31b339207b77…

MALICIOUS

PDF

105.4 KB Created: 2021-07-02 09:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15d6082f1751673beec63198983cc2b4 SHA-1: d332e863afb9a59251df1118499d7c0b2ce5d79d SHA-256: 2cad31b339207b77c6f70b5040e07ec1b7f24c75f405f07d2de84f30c3463b90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0b06212296154a93a7ecd6df4c515f68/wurorudefi.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b407b46143c---33468378158.pdf
    • http://www.kickcommerce.com/userfiles/file/togeruderatadirapixafo.pdf
    • http://gostinica-domodedovo.ru/files/fizegejalek.pdf
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/7657641206.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e970c80d8---ziruvirikiros.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076048bc06dc---60457146411.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/586410e10ccb447bbc35aa453fc2e96d/faruniwukurakefuwuv.pdf
    • https://agrilaui.com/userfiles/file/75181654750.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/265bd6bed21963e976e0d02b348f1c88/tupivajibunufovoki.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b00564be4---64776160963.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bf9e0e3d18f02778bc5f3afa5a19c978/3494989575.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b8530e3aed---zoxenidu.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080549a2ab9b---69797839241.pdf
    • http://cipetbhopal.com/webimg/files/41237263132.pdf
    • https://senhewood.com/d/files/zivigagelusenodifisulofa.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/2d7cb1fdc4779c15b4c587647a389aea/sawofasupa.pdf
    • http://constantemails.com/userfiles/file/162396415768649670549.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7553a6e34---bofopogazij.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef31a41fd---bubirivegeruw.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a8f9749924f6cc1b6d53d41c3d2f4151/22931122928.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e63819c53---25298101499.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/v5dcuidpqf1mlsvs6l9ucc6vac/zolexemumalob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dave+gibbons+watchmen
    • 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_off00013b30.bin
8b3d63f1cb050d99d39ce1583b9c4d9e8a3957faf44aa1ec6f43e1824f5b778a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 10824 bytes
font_01_sfnt_off00015411.bin
fecf9d83895e1f1869293800f377e3119033426f64795dc903e04bd178780628
pdf-font-stream PDF embedded font (sfnt) at offset 0x15411 17020 bytes
font_02_sfnt_off00018046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18046 16792 bytes