Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fd72b9c1b17cb3…

MALICIOUS

PDF

83.0 KB Created: 2021-08-17 13:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2397e62532c96d9f4f39a72016d600cf SHA-1: 1ea06864a325e94aa3eb27121494793e26ba2933 SHA-256: f7fd72b9c1b17cb33ec541d18f9e117333dce5d32d01184f0eed19fc5a4d3e68
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were directly extracted, the structure suggests it's intended to exploit user interaction to navigate to these external URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/316b1571ffe94c7e6d20153cf2532f8f/89338096009.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4cdb0be70f4393b0bf73e87dccd33c17/58751486423.pdf
    • https://andrejc.si/files/file/86102607418.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfd08e26c6---zexos.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/84099665435.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/50797084480.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/65593f34497ed0b064e2c358ddee4964/89168938342.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8f956bfb03fab1bf9812dcff6cd97622/lexifo.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d94c5c61ef8---17129535902.pdf
    • http://termitecontrolservicebd.com/ck/upload/files/88133948430.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/17879647399.pdf
    • http://f-kcc.jp/user_data/userfiles/files/79438553613.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fada79d1d---16806633603.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1bfb0a9f---7044822402.pdf
    • https://protradingindia.net/userfiles/file/takogijiw.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210715_80EF45F34DEF62D5.pdf
    • http://aeronautike.com/userfiles/file/81657701136.pdf
    • http://giustizianuova.it/userfiles/file/2258859028.pdf
    • http://jncs.kr/page_data/file/20210627001512.pdf
    • http://artetendasud.it/userfiles/files/68507875356.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/vosewavu.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210708_EEE1920EF522E4E8.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a977ddb8---kogifuxijojuzapanot.pdf
    • http://www.tramag.pl/upload/file/80927744191.pdf
    • https://alkathirilaw.com/userfiles/files/75334306672.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fabula+el+leon+y+el+raton+agradecido+de+esopo
    • 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_off0000dc5f.bin
c5520916c489697b0968d99397764f3e17cab32b19c9e3d594a689b1d00cf6ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 18224 bytes
font_01_sfnt_off00010a2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 16792 bytes
font_02_sfnt_off00012241.bin
a9b730180fc4d4456191dfd758e099300359ac81d7e7239e56d2ac4500990a49
pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 11020 bytes