Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4df639ca080080…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 15:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 824255b73179c369ece04762e3cb8a4a SHA-1: 12ba9fec80aed216a275b388d2a6150d5daaee05 SHA-256: 9f4df639ca0800803d5f4eca1ae57c5daf99c2b39d93cca0f4babd50c31eb4c2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chung-pei.com/userfiles/file/suviledepolirowojipe.pdf In PDF document text
    • https://bawwabatrizq.com/userfiles/file/36561510728.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/fisukigavorezi.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/95857627133.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109040845374886.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/78046335913.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad50c3e691---65516271139.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/zibosijitos.pdfIn PDF document text
    • https://agrando.cz/files/file/vepasalolusagixefejove.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ba9e2ad3bc80dda9e151c87a71ae237f/81612271245.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c505bbae61---20537612652.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jadugeve.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/lusurefijumil.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/39257273731.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/fijetix.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/68950353598.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/bolix.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/gaxazemej.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/sojoxajoluwivumawiturok.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/89726771369.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/51423511987.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ec34e7c6244f7a866e7ffeac8c7ea358/95514128993.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/87848781394.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wezuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=things+to+do+in+minecraft+by+yourselfPDF link annotation
    • 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_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 17372 bytes
SHA-256: 5a219776f5e1960b472b1b41d5b398cfaec6e79d451af78d43ae0e3b0681eaf4
font_01_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 11240 bytes
SHA-256: a621cbfddd08ff77ff1b881fc464651c92c2a0040b6729c691c118e85f4293c3

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