Malicious PDF — malware analysis report

Static analysis result for SHA-256 9114e868f71554b0…

MALICIOUS

PDF

71.1 KB Created: 2021-05-21 15:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00bdb687de9e4de094e431d9be646626 SHA-1: e92d178511de2fe666e3f3c7e89aa8bc436b804a SHA-256: 9114e868f71554b0d16fec549f495096633221f9e8bf0e0432fcf1aa67ebfb4e
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or manipulate search engine results. The document body is heavily obfuscated and contains no discernible user-facing text, suggesting its primary purpose is not informational but rather to facilitate these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160900330599e2---basonew.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a7777e68---werusamutas.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb74e47de3---47174597404.pdf
    • http://meteosputnik.ru/userfiles/file/dogotopovagupamamomugafof.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760aa7ba22---47665562573.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0955e250b14158536a3ca7d4aedf2496/porimubujaralatinotuvasug.pdf
    • http://ahkjt.com/upfile/file/16490508307.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3f202d8b85333a78e7f74e46dba7c5a4/rudegaweliwavekowowug.pdf
    • http://eko-inwest.eu/upload/file/gajete.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607187800618a---5181917940.pdf
    • https://sjalikave.hu/pictures/file/begotusidumoniv.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215211537173922.pdf
    • https://247christianity.org/fckeditor/userfiles/file/garorezu1620439655.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16079143d64fc5---livijuromon.pdf
    • http://productosole.com/wp-content/plugins/super-forms/uploads/php/files/p51uih6mijjouf9hdejg7tpdka/96322620792.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080df417bf2f---wivoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=are+dyson+v8+accessories+compatible+with+v10
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79c.bin
a3b59c716b25a9c13e0807ef89cbc9fd8e7a328fcee384a18559a27bf751be88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 6084 bytes
font_01_sfnt_off0000ec42.bin
4d0ccfec432e2b81448a4afe9d793ef4bf7a41fd8987c464ff829f57d57e9c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10276 bytes

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