Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7feb4e5cf1ca50…

MALICIOUS

PDF

113.4 KB Created: 2021-07-02 00:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86b534fbebde40274e815e45270486b6 SHA-1: eb17f457dee1ef5a2fe704c3c376417b0a048c32 SHA-256: fe7feb4e5cf1ca501ce596603f3dec4e6ae9cf628aa85cb87339871333d9abb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to the overall phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac579f0e148---nisigatobipifimolid.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/018a89ecf60b55e3985d8c68919b0877/susenesanozifofivepoga.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098c02783788---rodupib.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/06g72abalnjftmtaj5n8b46nuo/15882294950.pdf
    • http://brezov-gaj.si/uporabnik/file/76637001059.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8798bd53844481f5e820987af5ad38b7/jemijuju.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826ea273075---gojopesimisam.pdf
    • http://alliusie.com/userfiles/file/rukejeguzepoxaxobabufole.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nk39qe1ihfbijo7vetoiqlommm/49289347959.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e04f30a8c---76898704813.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210701_1F6D4CD84C136B63.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b86ecf100f9eb47fe0880975117772a3/zevevodipizajuposotepesof.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b47846850351571c0b8754a00c121a44/wuxaxinegakusudukage.pdf
    • http://docando.es/js/ckfinder/userfiles/files/94770722477.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1b8d0f6966b3814a6637790de16cd26b/70984358515.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2ab563aa4805e1b611c15312a010cb14/92112995420.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f535211e5988e80343970b3cd74dceb8/dorisopem.pdf
    • http://handbook.hu/upload/page/file/noxutemiwamikit.pdf
    • https://jamurgoreng.net/contents//files/jexupax.pdf
    • https://lesfeesdelhetre.fr/upload/files/wemamosib.pdf
    • https://scavilecis.it/userfiles/file/46837758229.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58c98a906d---sadosidewopixak.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c38932de41afda00606d7db68d2d8f85/59396764419.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ef0d4832e953e3ba65f0df37c50d225e/fusimiroxaxomesasuwaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+waves+of+feminism
    • 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_off00015a28.bin
6714e9ba3e966e39312a9fe53028e73bbb094be9fc23ba085e83dcf2b16781e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A28 17512 bytes
font_01_sfnt_off00018792.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18792 16792 bytes
font_02_sfnt_off00019fa9.bin
d8cb8a6173c2d03be616e0ae97caa3a835d57904acb2b34a50f2dfa2ec0f4e43
pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA9 10352 bytes