Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc9821e0ec258bc…

MALICIOUS

PDF

71.7 KB Created: 2021-05-26 04:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68ea38af551af3343d484615c19fe75b SHA-1: 55a804e892b347d11082c55dc300a45e5568ef59 SHA-256: 2dc9821e0ec258bc76b84589feb8f81bc88d34436648e532af420346c5f9b107
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on compromised CMS uploads. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the numerous extracted URLs point to potentially malicious content hosted on various domains. These elements collectively suggest the PDF is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9279

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7k5uvnnti61k2jmq7bjs3ddb4k/54486112040.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67cf0f95d---56241598117.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5150e2c8c---jisotelulamivutevejonatus.pdf
    • http://edgecs.net/documents/21415605190.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00b820bd7---rarijunobesugate.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6c16237de3e2f6d3d9a4c7df38377a95/safuga.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d2df18e82---figimipadorufidub.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c69a9bc1c397fcfa41b8d23884e59070/36578338746.pdf
    • http://doo-san.com/userfiles/file/20210508211041.pdf
    • http://ackerviewguesthouse.com/userfiles/file/kapasibadagis.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b806ab5185---40226499654.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/dbe68fdd21eb3c0e07f65b13ecd02f16/vaverinivevi.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1aa1bd99d---35408558441.pdf
    • http://trans-serwis.com/userfiles/file/26206691676.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/kozadafigofix.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gcqidipdurf2qtin32hbcf5fma/guwame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=misumi+catalog+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7a.bin
959e10770205bbc59796a20bd3f606c5e84bda9f674bdaed257b819c86c69bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 5044 bytes
font_01_sfnt_off0000ebb0.bin
8064a0ab9a499682a21aa2b533aaf1e03c94b54d66d77d4b6f5571dcb3c58880		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10664 bytes
font_02_sfnt_off00010ffb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.