Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8066dbc275a11d3…

MALICIOUS

PDF

84.9 KB Created: 2021-08-19 05:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 264090977cd0e374a0c5254685cecbb1 SHA-1: 7e262f426a0863232e89ad4d4e0287758aa0a9e8 SHA-256: c8066dbc275a11d3750a106c5fdb6d310527fd859e6f911cec43350c4d414d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm intended to redirect users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule indicate a pattern of distributing malicious content through compromised or low-reputation websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://shinies.ru/img/lib/file/91100413466.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d0e1aa3a80fe1edb5ccb9310fb7c60a9/21185803093.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/467dd8a66e45ac0acc8427771dcb96a2/neganidu.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/61267425206.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5743c5b8c385071dceec48fedad54bab/62004426830.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/22979176171.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094747c5bc49---tifowidewozuzoxogizani.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lf1ba85e5d4cblsh8pqv2j4eis/mazuzafureperubusiriferaj.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/kugovanikuxovujadabolu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/87492891395.pdfIn PDF document text
    • https://wsbtitan.com/images/file/8069482719.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/pasajuvip.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79cbb6364---85114219498.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bnjjbbbdus2p10b1mpupatvru4/deduwozipamozusone.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd64e0a089---tizimusozawur.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/molafobugikeso.pdfIn PDF document text
    • https://network-italia.it/file/vejafizikirujobubebekobet.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7594164c7---53800218729.pdfIn PDF document text
    • https://bhavalaya.org/ckfinder/userfiles/files/75546182852.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/43368415268.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0964bb151---79910675433.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9968b639fb---ziworivemuzumagaf.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/zifufenofezedo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b98a3a5ae3b9f57051234d6478888aac/51031335349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=operative+dentistry+books+pdf+free+downloadPDF 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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 16624 bytes
SHA-256: 098bfd5adb6a0ac229dc2a65b68cf3b006708688ef3b35f119222e8336aff213
font_01_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 11016 bytes
SHA-256: b38bc472aa44a5e6e1e2eeb38c0a7aaf68cd32528ea087226b66aafab00af9ee
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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