Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f9e7347fe2f25b…

MALICIOUS

PDF

113.1 KB Created: 2021-09-01 14:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdb69a701282d24aa0cbb69716979a9d SHA-1: 0589c58a7e13fb2fb17e4dff2250324fde19f292 SHA-256: a8f9e7347fe2f25bdb13e43e8dc89521ff3fe95e26e6d0ba6996c0c255c2edfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://biosurfest.com/userfiles/files/60940297635.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e13a9dd1---14538852218.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/84b3d1fb20dbd52baa8d856ffe48052d/12838563594.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160932ddbe0ea4---43907209996.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/zepunewemame.pdfIn PDF document text
    • http://centronegozi.com/public/sowifulijapenegewe.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9035f2284f663d07bbdb6cffe69ae284/birowosajaf.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/4396635636.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/18rujfl6u288m74s9j6uf6n80j/sibemajoboti.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/13992291496.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2e895638cb4d765ba15347bc0e56343d/65103902385.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b05691101---53704839545.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/50912113714.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/5e5db9acb6f7bff8671e04a2f7e3ae64/diwejira.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f5fb1e4b2d6726f5c1f7e3ab4c859182/mutozedasiperiraja.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1529504afb227e9769509604852fa40d/kazogaxevakuzuselebavo.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/gatewinejimeges.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71febcb488---15427057635.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zopozijituwavilotanosumi.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/1891342331.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3f1b8b5bff97863e37e02d6b31bd3eb3/nuvotonuwamosej.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/kufirupaxafegusojuw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2066346d26---20453011611.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/lonutizisuxufogifuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=square+cropping+toolPDF 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_off00015168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15168 20028 bytes
SHA-256: d415b2527189737bf19f583ae8390a1642132296bc849b12871a3fa5a2d4f8f6
font_01_sfnt_off00018544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D5B 10704 bytes
SHA-256: 48cb08b3d2549513fc3815a3ec822b11461127703fa0f69c903570399b6049d1

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