Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9f0635f66e3e1e…

MALICIOUS

PDF

81.7 KB Created: 2021-06-25 12:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0615a03ba5de01780aac93a35c50f5e1 SHA-1: 3569d9c0195dd832ed65ff8efb35fb7848060a33 SHA-256: dd9f0635f66e3e1e34d13b01b761ccd422aa5c901a0956922f893277a9437cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://anukulagrotech.com/userfiles/file/61219869731.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16085df8d49c2b---lodum.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ef4eef37e1d05ad37f686f1a0ab0e0ad/52379488755.pdf
    • http://sammyuriasproperties.com/userfiles/files/37257106391.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83d11652cbd6e7568a8f3dab66a59346/rulijamujuzaze.pdf
    • http://rilta.net/userfiles/files/borarajusu.pdf
    • http://arniestribu.com/campannas/file/20667001034.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a463a46d7c2---69547404280.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/silfusc10to8pg4jb6evskism6/farirogaralizesovu.pdf
    • https://businesslife.com/content/file/83204233796.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c7a81c6a7---getenenopemilid.pdf
    • http://caigeshi.com/uploadfile/file/2021061811054573499.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2d0314e68199c2d284fcdc1d4232b6c4/63851392482.pdf
    • https://primer-spb.ru/files/files/53289066790.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gist+tumor+survival+rate
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e000.bin
74275adff6774661d7cee6db1dbdc9c36936046da026f71a852017451293aba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 16564 bytes
font_01_sfnt_off00010abf.bin
df8e38ab1bd4d126a219fefd510b7d6cbf15f0c0114d16d2440896238ad80584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 10372 bytes
font_02_sfnt_off0001224e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 16792 bytes

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