Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf45355945b4fa9…

MALICIOUS

PDF

76.0 KB Created: 2021-06-26 20:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 781cacc6682671b55090de560d819880 SHA-1: d455af425a40afb371386d1abc0f53ca1b744798 SHA-256: ebf45355945b4fa9434b9a0bf0e16403f068f0d7959f90759a03b733aa4687f0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phishing content. The presence of multiple external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5c1750cefe7e04e02330947033a1248b/60720958369.pdf
    • https://gw21.ch/uploads/userfiles/file/8532297305.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c9a613117341b6cabb65eae8e4b097e8/demoneganedejajutijufodi.pdf
    • http://www.awakohchang.com/image/upload/File/9073105024.pdf
    • http://soluzionebenessere.eu/userfiles/files/7091160424.pdf
    • https://coebmsf.com/userfiles/file/lapup.pdf
    • http://gapoom.com/upload/fckeditor/file/60550350344.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284923a679---43219513072.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cddb1404d---37381208945.pdf
    • http://doktor-okonski.pl/uploadimg/file/rezadavowukovetinozuravip.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2483430a45---kibesezodejafumefopezu.pdf
    • http://fixafilm.se/userfiles/file/rijagadopopad.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0e1fb312f082bd23d7e2da2eb718471a/82198531973.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/aea806470826e8abcf087ba8f2e66046/80625999193.pdf
    • http://asokmontridental.com/userfiles/file/86529624900.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070947fa4cba---towupukawegijuxewob.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/642a52d299e46eca2a1e6aa452207638/kejefaxe.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269327a31f---35461547247.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/88294951242.pdf
    • http://alacarte-design.de/userfiles/file/vofujuzelir.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/js4vc3vgphg9noqeq8lrdtriob/93426249530.pdf
    • https://mecaniquekd.ca/upload/file/tapazat.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d595844bdc---28573728143.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nulls+clash+of+royale
    • 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_off0000c8fb.bin
0f020d7d5c89727079b16986c9072be8736cb4518e86f1f05828acb9065fb76d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 16328 bytes
font_01_sfnt_off0000f375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
font_02_sfnt_off00010b8c.bin
d329107b2ecbae1fbcf5324bf73e610e683362695379b1a97067bca69a81bc3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 10332 bytes