Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6df705e0283ad5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 11:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3399477b93d0afc3da2d27cc0f5c703a SHA-1: acde9a3ef1843b8393debf5544c4acec630cbf07 SHA-256: be6df705e0283ad5d3749b95f2a9bd8a4c6127e631b8e421d0c67cc0bebd25a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised websites, many of which are hosted on disposable domains or compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=fun+online+io+games
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/0j0bjnpgg09qllto270fs6mnsb/23513415686.pdf
    • https://elesud.it/img_pagine/file/sipusewovewixelupe.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/50139818711.pdf
    • http://lemonsport.hu/upload/file/koxuvuzepemakolonowovu.pdf
    • http://brukikostka.pl/uploads/page/file/dadawekabilegosa.pdf
    • http://www.ondebiz.com/userfiles/file/jinov.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1a4eee75---nepimofajumuxobujesuro.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c2366322---limamataxixitozebadipafa.pdf
    • http://vrzion.com/data/userfiles/files/jowumesulubefodi.pdf
    • https://duvanco.be/docs/files/kaliberodaxuwumubif.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/solipuvojubosevupudo.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387535e6162---27568457703.pdf
    • http://karpatskiles.ru/store/files/fojibetufoluvovagu.pdf
    • https://amgaa.org/temp/files/koxujidogaroduralip.pdf
    • http://newcityhk.com/userfiles/82263347841.pdf
    • http://www.farmaciapenil.es/userfiles/files/10756310809.pdf
    • http://ametansk.ru/uploads2/81916497495.pdf
    • https://luckysurface.itweald.com/uploads/files/61395586abd67.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/74e852b19011f4c1f6a7ab2051fd55b1/suzelomopazusedefe.pdf
    • http://straps.by/ckfinder/userfiles/files/29483790372.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_off0000dc50.bin
4dd452a90de4abdab874efe390d88ed12b658256848a40bd59e6637da597df54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 17844 bytes
font_01_sfnt_off00010af4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 16792 bytes
font_02_sfnt_off0001230b.bin
6fb1202bb779231dfd47fdf096495fc1a5a6208c09b752519b6403ee7d8c77b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 10328 bytes

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