Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c04182e9fdad38…

MALICIOUS

PDF

87.2 KB Created: 2021-08-17 19:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 344167c21a246ccae90cae8ef7a49735 SHA-1: 7d8714666ff10a1d3c8a9d3a1a133c2c08663e88 SHA-256: 66c04182e9fdad38aa43f0c5dbbe86441d3f8d7ca9283638644b9042e05528f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=bronze+age+mindset+full+pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917c2cd9e00---gilekiwid.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/18624361586.pdf
    • http://myphamlulanjina.com/upload/files/65370044393.pdf
    • http://jyjwqj.com/uploadfile/file///2021060511505530.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/vefixulobuvadexolobi.pdf
    • http://skyparadisecoffin.com/images/media/files/65713806518.pdf
    • http://kursadowicz.pl/Upload/file/11092750655.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3e9569fe1---luvezejisefo.pdf
    • http://brlairport.com/images/file/50400277407.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607649e0d334c---14251585269.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/hh6ut2ae2rbu9rl9mnfh4a3b51/foketilanaxinesub.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18cf03e047---roxijazulevirubu.pdf
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/44359063327.pdf
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/telajozakizojopeso.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72908a285---kofuvobakaxagifomapojewur.pdf
    • http://lws-realestate.com/userfiles/files/9197080782.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/001acbcf25180aef452ed76f0f31c045/totamizibibevaxe.pdf
    • https://led7.ru/file/80644466979.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160709401d023b---lutavalupanebidemug.pdf
    • http://anandtouristcorporation.com/uploads/tiduxexotaxefugodefoxela.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16117d83b26fb2---zeraza.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c880c3ba---milip.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ff47a00ead4fddf4785ae0540bf1f436/65977215187.pdf
    • http://ampletrekking.com/userfiles/file/6000789339.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cecb7aaf09e5a573b4a73255d3a42df5/64573991605.pdf
    • 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_off0000f091.bin
3d85d66f3bd442a8b0a29ac51a45361291e1cfb6a01566757385cf5056157aed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 16668 bytes
font_01_sfnt_off00011b84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 16792 bytes
font_02_sfnt_off0001339b.bin
f7d1b5e76e6a0c431511c95bf7d7239ec517e238ed79cb587cbcb3a4d15d1921
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 11052 bytes