Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d7ff055a9784c0…

MALICIOUS

PDF

72.8 KB Created: 2021-07-02 13:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a81401daa09de6d4940730f6d9a30bd SHA-1: ea84aca211c7efd6d774c22167f88025eb22a73c SHA-256: 17d7ff055a9784c0b58dfee45d494b167f7dbbfa3b798f70ca83d6bd3c66cd7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a download button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2f8a6026a21462c71324fc6de27f430c/togijuxewe.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f5447c6fd---dabiwurisuji.pdf
    • http://cerrutistudio.eu/userfiles/files/noveguv.pdf
    • http://beulahcooleycollection.com/clients/870349/File/vezexilefeviz.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45b785377---bufusego.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/39nkmnho7fpihkaeqq6bp7n0v6/71309447346.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6r7f9f8at531m42m2baf4ro0te/10453907966.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/41418769717.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3052b198fc99dd34782b81d80ec0ec64/fevagujiwezuputi.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8ed05312---papan.pdf
    • http://omegapizza.net/uploads/files/14139258380.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737e59d61c3---manavitixelufazedefune.pdf
    • http://adance0112.com/upfile/editor/file/fowonaful.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87b2964ed---54184842753.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4fd3934385885ac9a9d4fcfd76ae7476/47194366179.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e7181cdfc32400b296fcd4ee9b1e969c/32239636053.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7310d3cf00bb737cdaa11654d1c85afb/satedamu.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acddbf77c---10625699995.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/213bda9cc9786dcadefac54e3a2b79de/rekuninevasikowum.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/04c81542b0d849141f5b81dcbde48e99/62716387598.pdf
    • http://ahchala.com/img/file/solozetudonuvixoxek.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83517726e---96014663766.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=design+and+analysis+of+algorithms+by+udit+agarwal+pdf
    • 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_off0000baa0.bin
f2a3e50a328413d5f0d235bb54f424b02d6e713e49469807a18868bec920eb8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA0 15736 bytes
font_01_sfnt_off0000e31f.bin
7f59e7dd646d64f2fe24b6376759bdd362ba5a0321b81aa470a73e5d1a12e642
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 11388 bytes
font_02_sfnt_off0000fd6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 16792 bytes