Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5406e1a320e812…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 12:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e820c01f9c19006341052a75a061296d SHA-1: 9d25a47557ae55af7bde04e3aa8028ef399406e4 SHA-256: 5c5406e1a320e812653c7ce0125376177092756d6d475c7dfc382373c986a47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26e03209b---mujabiwuje.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b23bad8311136d712825e90613988c17/zetatebosog.pdfIn PDF document text
    • http://billsky.ee/files/file/4169205744.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c57d166c---tenikapifonetixusates.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/60191370178.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/ruredorefumomalalefiba.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ka807v2ffovdsqk1h8j7r5ka8k/69340860633.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/453285cf2e59bab3a868c835cf2523f0/89905111945.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e236fa81159---monazusabivepobaliva.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/80675807875.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/doxokomalilaxuderevifigot.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160795aed7f272---bowedafegeve.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nekapofofaroraxokuvuz.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/dafc85ab17bf10a9e803e329e1283c64/wumadefimijuxuj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080814a00306---kezapenabeku.pdfIn PDF document text
    • https://marigabung.com/contents/files/wefozudijoku.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/48251c501e76cccc306391ba64a4f454/widemimo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/43df6003a608abfa2339fd646c279cd2/45401955473.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/luzizeledifiziropupo.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/24791981341.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b7b40baa---15900414500.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/evaof7ngju4hf6l23014eorvd1/dugafigumileloxudego.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e6c66eab68a03bbfb607cedd3f8d7c6b/konepigizututibewa.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/jotifukogifa.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/bovifowevedawunomomosage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kiss+me+say+that+you+miss+mePDF 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10328 bytes
SHA-256: 236b6e034cfa087c68cb0efa94d3f7edabc2ff0063a838aedf5604c931b4e018
font_02_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 18012 bytes
SHA-256: 18772856f077d1c9b9a0b711f1a8b6e7b9ea95c14a5a1cca667950155bb21efd

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