Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfac929678425d0d…

MALICIOUS

PDF

77.3 KB Created: 2021-06-17 18:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d27022a5376a5072904c767f315c638 SHA-1: 25fccdc0708f5abe39c47539a7cda8e1934cadba SHA-256: cfac929678425d0df9896182cac1e26ed7d5121a785f238f83a5100386d5db21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics suggest an attempt to exploit SEO or social engineering tactics to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://creptiles.dk/userfiles/file/25141714877.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4fc7b32ab71a0d452d5ac520c0d17a91/70874204610.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4ef92594e---90371854596.pdf
    • http://romanakladatelstvi.cz/userfiles/file/79850062622.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e7e297a8---devawanudomejezopes.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608113608f300---47427259417.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71d2692e6---vupawugadi.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7hogmk0f98gf60nohnrmkbqci0/pekapesar.pdf
    • https://local-atlas.ru/userfiles/files/6380724862.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/75415172540.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d09e1342b3f1bdbfae28b8429b781bb1/vevogo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bf0173d260b769d357adf3c759ef8798/puwokasuzebipomofuwu.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5485161201---wapuxebobumofuje.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c007cbd3768---pulevumabed.pdf
    • http://bandenplaats.nl/cmsimages/file/42136310927.pdf
    • http://generaltubi.com/container/ckfiles/files/fibuvik.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e21644f07---37541208826.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bronson+prison+workout
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a0.bin
36bf5cae2d72166201eecde9e4ada9b6925c2e18c6996a3eca6037323fed618b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 4776 bytes
font_01_sfnt_off00010206.bin
2a6c756bd2696d258d77acafbdcc8b34729d82d5237c3d1c3351ba397cc06bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 11236 bytes

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