Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae9ea06b469ef6f…

MALICIOUS

PDF

78.7 KB Created: 2021-07-09 09:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8c2d5b7582f22cc61d5c778e231b134 SHA-1: 13477913719d6eeb87901e813ecaa76aeba70160 SHA-256: bae9ea06b469ef6fd3fc18e67c7dec1be9abfcaf6ff38da0973fac71919a5bc5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e75bb316---35178537705.pdf
    • http://motorlustor.net/userfiles/file/19645543792.pdf
    • http://paillasse.hu/userfiles/file/devewuweko.pdf
    • http://france-ex.com/images/blog//file/texojilokikubojopogofad.pdf
    • http://nhs-carpediem.com/clients/46367/File/gaxuja.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095e1a29584b---xejutesijajadotiwu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mtrpboodqj26tih31t0te0ab5a/budapikokina.pdf
    • http://usmleworkout.com/files/file/54666505864.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipaxevufogiwadogusinum.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fcbb14c0863b016360aa7877cd4d24e4/85521560934.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57e47c6d4---48200114767.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cd28e2c6e---diganagafubitekifajakepot.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d793760e745---52760376264.pdf
    • https://fonixkoncert.hu/upload/file/73181519074.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087398dacf97---32900811576.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f10d0a706f0f65bce62c238ce20aea33/filegizikigezegudad.pdf
    • https://bataretak.com/img/files/file/rewupivomok.pdf
    • http://dragonera.cn/admin/userfiles/file/moruvale.pdf
    • https://mysilo.com/upload/ckfinder/files/kipulisipe.pdf
    • http://evohome.pl/userfiles/file/xenotekumamemumebotosuso.pdf
    • https://briljant-maleri.se/UserFiles/files/28953094847.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c9ef38c32a495f27182ab605dcbb1d35/xejobepamuvomuwem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=telugu+mom+and+son+stories
    • 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_off0000d368.bin
548c54c7facca1716225343df9b11507b8794f8fd1a4ca22e72829813045ab07
pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16192 bytes
font_01_sfnt_off0000fd48.bin
3d4991ad3f6ae4bdf4e9a17361b3fabe6b734321e1118251d35a56164c4c113e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 10656 bytes
font_02_sfnt_off00011575.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 16792 bytes