Malicious PDF — malware analysis report

Static analysis result for SHA-256 398bbfaee78fbd7a…

MALICIOUS

PDF

71.5 KB Created: 2021-08-17 05:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: facd79c66154c0dc52e0e56c1956b868 SHA-1: 426c73de82c4030ceace0898d6380f7fd1a36494 SHA-256: 398bbfaee78fbd7a4f057f3b966c3850f60ac73f2dbd61c7bb6b9f9858f9174d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=what+is+your+blood+type+worksheet PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abc149b2383---rejivotatoru.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080694d14754---dovimubiwalubawe.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/kiwolobatifovalexowaliroj.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fawali.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e924b18520a01c070a5f7d80d7fe1589/vofej.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/5762037289.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/desamubesab.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086625291ce3---teviwezazodutuzabop.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zosenitoxeg.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/64039702022.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3d24b614---rizikizolawesarikixugovut.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0780793001629067587.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/d2fg3hkpgfkmig0mm8opsmf1q6/47056950715.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/reguwoni.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/bibesolokifas.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/aht71octqkf13v1mmq9iurhuf4/tasexuxebufegebo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///96127635819.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/98959570376.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d4ca9dbc93a230c3fd82d57f44395de5/56260247906.pdfIn PDF document text
    • http://jump360.co/upload/files/20210620132520.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/biluvopuvifuki.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB887 10908 bytes
SHA-256: f3e080e971d2653502531189c3460e224b120a43aa4e4ecd01e39e88feec18d5
font_01_sfnt_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 14764 bytes
SHA-256: ebfaa5d0a5c206527fec936c8a39746b8c9939e707584e8a2f5950c257e1fa27
font_02_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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