Malicious PDF — malware analysis report

Static analysis result for SHA-256 6275a74851088878…

MALICIOUS

PDF

96.4 KB Created: 2021-07-25 01:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 993db0ca5a674d5ff66c34731b4da9ca SHA-1: 4cfea1434bb845ef8e7fc8312a6faca4ccdf81ee SHA-256: 6275a74851088878b0fd6dda6792d2bd6031edda03c34047ca7c351351185e8f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating an attempt to obscure the true destination. The ML classifier strongly flagged this PDF as malicious, and the structure suggests it's designed to redirect users to potentially harmful content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160755c8e52aa4---bapux.pdf In PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gm7ur7egcithbig4up612d2i5b/kuramowivi.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zokokok.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/55310713599.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/jefogexuxitar.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607de11fbd95b---gefegurenakulul.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/78298629568.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/88625450551.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/pivir.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6ca828b1703900b3ed42f6fd780a9d71/65283781922.pdfIn PDF document text
    • https://giustofiori.it/file/97790249292.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/sumozegapujodogozu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hduvqjcrap3mifeo10v0mndhbo/zaxes.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/dojevuduvijuvedeleto.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8f5449b23231c2c5f41f6cbe8360189/76350892035.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3dbeeqpgifelomdplh4cl9373/88208077482.pdfIn PDF document text
    • https://efnnma.org/files/file/34256082721.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0cf8495b9---gorelinomemujepuxonari.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///rujarobebalisuromatobexef.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5c1826aa16f972ad4720b1149a27f628/jukonizowobugesek.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/88835099200.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ff54c14288ac832e4290e68ab420f9ca/23561388003.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607036d8d3ab4---6561106467.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/wudiled.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9b4cb00---mejemudivekobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+cheat+on+huuuge+casinoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10540 bytes
SHA-256: 05c23c2fa1ee3e07039021bd978d5b426e19f421eb74a000287cca5d99d8a6c3
font_01_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 16692 bytes
SHA-256: 4b1c069cfe5925294960dfbcdf3752c4ab08352fc7dca9cc04f6823ec0e24bc9
font_02_sfnt_off00015a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1