Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc66433c72a37a05…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 05:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5836e246ca2c48908432eb86b0f6ecfb SHA-1: d26d142da979eeb84283f4a0260dcea9f438123a SHA-256: dc66433c72a37a05a77c32306271c34a8f99a75fe5d5f8c6c16d0b47ea1fca9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to download files from these potentially malicious sources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=free+download+imo+for+android
    • http://xn--49s538bo8ux8c.net/userfiles/file/16903035068.pdf
    • http://specimport.by/files/files/31077987609.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2cbfc3c7b53779d8f1e0a9e7a3a7cf27/27210416693.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160705f91277bd---66889618208.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c89f890d462c32706ee8691c2fea2f47/tofefepiluraw.pdf
    • http://jngf.cn/files/file/tipeguxuneledapojeki.pdf
    • http://analogsys.com/uploaded/file/1319175279608c149304e3f.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3af6c9a77f---pisigogijeti.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e6c1a262---12470008607.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/008bcba3396b814e544b91b181b600d4/lozerekimurajogigejozuxo.pdf
    • https://trimix.bg/UserFiles/File/28813112639.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051805234173499.pdf
    • http://atol-res.pl/uploads/file/dixako.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3355e918e50c59cd9aa08bba10850f7b/runiduwovaje.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/jrkkvljninipoo4rbfghp2okdu/pasazoxaxazujibi.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4c085881---82839238419.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ck0d12ocfcdhujane2huh7bvl6/paxolukoridetik.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3e4aa2668ffc5e314f17d827a489174c/vodotikoxob.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/zezufovofosi.pdf
    • https://plentis.eu/ckfinder/userfiles/files/4478889016.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46cff1ffda---12291933187.pdf
    • https://mmoxx.mn/userfiles/files/86078189232.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609497f19fa3a---79561123045.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f687574b1c9f1bf455af715d0ab6e86b/75279268373.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_off0000f727.bin
53050ab5578678307b112e2753d0085154f149b327a7f090cc89ca6fce925468
pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10312 bytes
font_01_sfnt_off00010e54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 16792 bytes
font_02_sfnt_off00012666.bin
a36c062793cd751955f9b1f8fee8fe3f0afdf237a61d9f39f99534f245117084
pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 16636 bytes