Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fae4c73ec063a4d…

MALICIOUS

PDF

97.1 KB Created: 2021-06-26 03:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 359bc2cebfb2f498d8b358ae4005b437 SHA-1: 334195d5423302acf1ac6dfb0decd6b0a34eef02 SHA-256: 9fae4c73ec063a4de4eaafe51c41c4defe752e17e6d92e0a08d9a03489b7b81b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. The presence of embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e3e657e01603828fa0b145b6c0fa27d2/37656948782.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/62gfnb6fscqafhd6q492h4plu0/2351794390.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8a6ced0e4575918fbd7cbec70dba6efd/zusunexebalijoje.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fd10ba3349dda98b7e5be28d54f92753/pobodujik.pdf
    • https://alexandrapanayotou.com/web/images/static/file/rigifazizetoxofob.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6d2dgeb4jje5pb9m2hm9n0norb/39090447308.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851b7fa1fa0---40926697065.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d109e9395---miloji.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24086486c9---63366797944.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fddf3410---matejelotebufataroxujazi.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6fjrakaamn3r9jvfqviugkf2iv/vowukemanisado.pdf
    • http://chieucoingason.vn/files/garetogalowefob.pdf
    • https://gruntbudowa.pl/files/file/vawitojezuxaxoliwafeduf.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f2b82cdd819ff593b5c2cf09d678e89d/58170719085.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4c2434fd3dc063503926d0cbb529288d/84335469619.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160886bff7a974---tifowuna.pdf
    • https://mlmrockstars.com/ckfinder/userfiles/files/fupevalasanazufit.pdf
    • https://cleaner.pl/userfiles/file/21756724364.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f202070a4---farotezofuduzerebasaz.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3ed4237887b536ff0a3c6e1c8a809ef3/siwofubeniwezadagomo.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbf5cc895---24724876665.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5bfac349---97970603290.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074960cbe369---popodevemilifedufil.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ace46119---47869775628.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=funeral+resolutions+for+a+classmate
    • 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_off0001164c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16792 bytes
font_01_sfnt_off00012e63.bin
d26d877ca7a4f535e2f7940e56b1038bf9f7cc2979102d6ffaa29d134cbf2022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 10576 bytes
font_02_sfnt_off0001467d.bin
d11ab02fa8961d042c6accb201536677baabaa7e115cd470f9f98e6772f45b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1467D 19740 bytes

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