Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c4e724a2c136b1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 09:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bda9390defa2b07b59036091f4c44c4f SHA-1: 2a0563724e058458aa88fdb1404ebd8958742a82 SHA-256: 80c4e724a2c136b137c4361bf92f402bf9b92507cd25a55621b56ac781ae1f77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm designed to host multiple malicious files, with one specific URL pointing to a PDF hosted on 'suportti.com'. This suggests the document's primary purpose is to trick users into downloading further malware. No scripts were extracted, but the presence of multiple embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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 http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad740dabf---guvemozazitego.pdf
    • http://medob.org/SITE/files/editor/file/defegebitubi.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/jisavoxi.pdf
    • http://letnipohar.cz/upload/file/manapoxudadesiwix.pdf
    • https://betamachinery.sa/other_files/File/42083828720.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/viwumijafuvesinosodin.pdf
    • https://cryptobasics.biz/uploads/files/87887213964.pdf
    • http://yjccnc.com/upload/files/wixisofo.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/xamutetinulumovez.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/29095458740.pdf
    • https://booburger.myagenda.cz/pictures/editor/files/44173771074.pdf
    • http://dorp.pl/userfiles/files/70727485198.pdf
    • https://csmgh.net/pevron/www/img/file/78000133450.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/nefigiramubajefudibafiwip.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7fef4cc1205558b46ae5ea7866de302c/54584129824.pdf
    • http://heydarbaba.org/resimler/files/44275849578.pdf
    • http://balcimimarlik.com/resimler/files/81416197373.pdf
    • http://runnersavezzano.it/public/userfiles/file/56129427895.pdf
    • http://didula.ru/img/file/vuvixupo.pdf
    • http://cjpharmtech.com/upload/files/96532077715.pdf
    • http://fese.in/ienupdimages/images/files/mixavixofigexi.pdf
    • https://pinkrali.com/calisma2/files/uploads/84867550212.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mcpe+hack+mod
    • 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_off0000d416.bin
bd00e3c8845f11f11f89609e01a4a5cb3652728bab5f6b0a1b039f29e86f32bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 10256 bytes
font_01_sfnt_off0000eb1d.bin
83bcd390f5f9c4e4518596ce3241ca6c39e714a8a41cac7fddf41d667dc45a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 18516 bytes
font_02_sfnt_off00011bc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 16792 bytes

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