Malicious PDF — malware analysis report

Static analysis result for SHA-256 0742129f47d2b2c7…

MALICIOUS

PDF

83.6 KB Created: 2021-08-22 01:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa4292966ccbaf75aa4d7655ee4605f8 SHA-1: 025b4810fd2f478a2c6c69043ab1c7fc80bc4215 SHA-256: 0742129f47d2b2c7f8bbcb1f1c6a3060231d423aeb548d646ed86479d2562b5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://infrive.ru/uplcv?utm_term=recent+guidelines+for+heart+failure
    • http://domgr11.ru/uploads/files/tujuripuporesodoxakari.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/80364364672.pdf
    • http://aexpress.lv/index/images/up/file/nariresogafumixe.pdf
    • http://ykzn8.com/upfiles/editor/files/95927760112.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/179815147b48778a768dd2a0eb25105a/lumupuzu.pdf
    • http://dorapeyzaj.com/userfiles/file/finej.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac52fa33a3---26642147090.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/fazososuredileke.pdf
    • https://mgogs.com/mgfiles/file/29179068975.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b8a2952e2---moradivijubuxukarasudomu.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbb4bd53d---jonikuxovidegaganuvu.pdf
    • https://gifarlcm.com/upfiles/editor/files/tugavesibutojur.pdf
    • http://ndt-tl.ru/upload/file/43879920020.pdf
    • https://baobihungphu.com/media/ftp/file/81870840209.pdf
    • http://barcelonahotel.vn/UpLoadFile/file/katelakezosow.pdf
    • http://studiotipaldo.com/userfiles/files/tobolof.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kuvopirigabekavup.pdf
    • http://immopolignano.lu/images/xetipusu.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/fb14ec7ede7fe7bd7bf2bd4e7d2defcb/kemovelob.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/29246975834.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/01ho2a30rodc23abda7flp89hr/3044193785.pdf
    • https://metnar.pl/web/uploads/files/finurubuzurorogisorom.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdcb7f277---muverizagufej.pdf
    • https://seo-methodes.com/userfiles/file/42357634668.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vajalu.pdf
    • http://chono.mn/uploads/userfiles/files/93297401852.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160846311115d1---mozuxe.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_off0000e266.bin
1e8c8680336262940c42310fc9de29d93bd8a13bbedc8b05294468183dc9978a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 10900 bytes
font_01_sfnt_off0000fb5e.bin
e6e8ab5d8e0d8398a9d804971f8d529be47c90691c90fe31bf6036d62226c8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16904 bytes
font_02_sfnt_off00012774.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 16792 bytes