Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87a5f80a0308f2f…

MALICIOUS

PDF

74.9 KB Created: 2021-06-02 00:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4852c2e3e0f180313b77ccdf5f76eeb5 SHA-1: 1f2ed5851607962ac7e5013c0897f19fde9e5c1f SHA-256: f87a5f80a0308f2f33965150aa4b381c27983ce8425c8479289c17d8d7b9a189
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=los+renglones+torcidos+de+dios+pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d946254e---44989942552.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tv9icdf03bsl9lqfne79r9s6dq/kafusa.pdf
    • http://healthywithhart.com/res/file/bivalilodemuzugenefixa.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/dce9d1336d9d239963d0e3ac68830bf7/30336768069.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0cbb2cf3---nijiwetisuwake.pdf
    • http://accessiblevehicleservices.com/userfiles/file/xigelogunefikigupere.pdf
    • http://gtshotel.it/images/file/67318356402.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bcbe19c27f5f15c46ae753aa22dc68b9/9565999440.pdf
    • http://ed-web.cz/userfilesfile/matakeken.pdf
    • http://dyglas.com/userData/board/file/8886737791.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7360610d665676074006132931643eea/giwirasevux.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c751ecb666---87414087420.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f473952077---25880853393.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620fa3de5b---40517967714.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1187b1ad8---lomaxixofusubukalane.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9bac68e93---23494363470.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72098d36b---39917992069.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1f3e2dd4fc2006b13f2f896d42933b46/kixefikepub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dafe.bin
082c89522e4251f0a814862fddf633b1dac669eb780a02580130c1f52bfffe84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 3312 bytes
font_01_sfnt_off0000e6df.bin
d6cbddf88adfad9f4b075d8088e25b261b82ffa53f34fe9fe3848c6734028e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 5056 bytes
font_02_sfnt_off0000f82b.bin
6287903e874734fdac3718e12160e313b33cacce82010aa6b3f108ddec978eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 12488 bytes

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