Malicious PDF — malware analysis report

Static analysis result for SHA-256 4660ec8c0ab2d9a2…

MALICIOUS

PDF

81.0 KB Created: 2021-08-30 16:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cb4c69612db4c90fa3592023029edab SHA-1: dfdc7db10321407d059325dc65ad9ecc8b848877 SHA-256: 4660ec8c0ab2d9a27a9bf95d884fb66aa4cef7153e0935174431ff82abaec1d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/uplcv?utm_term=degree+3+polynomial+with+zeros+calculator PDF link annotation
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7856054407f767dd0548ed7b3e3b5250/29255264308.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/1638984564.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gm43cu1u9u8988j0ht5v5vn1b0/19647829418.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wurijibakanupapopagilino.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740a72d0dd0---81168085153.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/palasugigilogomapiju.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/fixisojonabu.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/10094688469.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8dc6edd0---vinadarusogominu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7902419e---jemukolojoweb.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fjbmnj0ol9ihomd6hq1ceicq0g/nurotapirudiremiwawaj.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/tidazabisivomiture.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mulewajesomud.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/wosotepelijavi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2f84dec6---20445763721.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/katemosokazopa.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4728f6ae0b1a6971cc184a57e68b76bf/novolimulawogof.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6011a39cde3c07d2beb26d6fd37917bb/59072288345.pdfIn PDF document text
    • https://cakkue.com/contents//files/21346367423.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/vofop.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16103df4dc8d35---80715020015.pdfIn PDF document text
    • https://j26clean.com/upload/files/91461392917.pdfIn PDF document text
    • 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_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 17572 bytes
SHA-256: 9724b899091ecc717454b436c4a9c889acd253e077a1375e93c01f2d5d49eebc
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 11356 bytes
SHA-256: cbe34baddbcd623e1292a59877b30a6cd91bef577cc53d457c0cfe49c15b8a7b

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