Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf31f88d9afde75…

MALICIOUS

PDF

154.1 KB Created: 2021-07-13 22:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 943697e11649c78a4f153c32a9c1112d SHA-1: b7863742cba61f804b94450f10e99457d263d704 SHA-256: 5cf31f88d9afde7583e264e1d97b5564274fbd9e3c5d20213b346b7be8114439
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple potentially compromised WordPress upload directories, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content hosted on various domains. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3335

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 http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bddb4ec96---wujirabovus.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14dd54d3f6---fafodufitofawalizi.pdf
    • http://bundoreh.com/fckeditor/files/file/16876266436.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc03822b6c---23582072126.pdf
    • http://novussiteyonetimi.com/uploads/file/42398493232.pdf
    • http://kingtonkatsu.com/uploads/files/30593598047.pdf
    • http://cortabellanews.com/userimages/93214906880.pdf
    • http://balone.net/_upload/file///kiwanagux.pdf
    • http://rilta.net/userfiles/files/kavegibiv.pdf
    • http://musikpark-live.de/userfiles/file/6062210691.pdf
    • https://restavracia02.com/userfiles/file/84770748661.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6827c72c4e1585b895188b88056b8dc0/fevotutikobi.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/47450763579.pdf
    • https://groupburuemas1.com/contents//files/2902834315.pdf
    • https://zebcom.in/userfiles/file/vonomolovuloxetupex.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb1d56e7f---58878967664.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s9vqjr29hmc32gav7odotk4vge/womifitutigefijudufiki.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wivopogu.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c625b224b9---wuletaxizoxivixoxofuki.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3ce1b8ae---16587000909.pdf
    • http://www.logomarcanet.com/userfiles/file/48061992319.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6cc74886---80963737090.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=days+of+february+2021
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c156.bin
40b76850d567052b04d16dceaab5683432087286eaca94d29791da12c5bfe022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C156 7824 bytes
font_01_sfnt_off0001dc30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC30 16792 bytes
font_02_sfnt_off0001f447.bin
56f397334842428b5d3b190c31780dfcea852f6370244ea229f26d94200fd737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F447 10516 bytes
font_03_sfnt_off00020c78.bin
7762e2497a59c9a5e607ec8bcd403476acc6b1d5fce78f8332f24d8ddd61c81a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20C78 16992 bytes
font_04_sfnt_off0002253c.bin
e81b026cfbc2eb237f1ca746bb7a9cfb5a9172b5d122e4e88b11530104b33fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2253C 26940 bytes

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