Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f6e97e28997ee3…

MALICIOUS

PDF

120.4 KB Created: 2021-07-21 16:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 293c2b7d058288a408fe3b1ee51d7adc SHA-1: a76ddf4f207e716652c9c1d5cebe40a66c279c4d SHA-256: 27f6e97e28997ee3b93039dbb7aace39680efaca20742f5e0e140e28ebd4d5db
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts hosting PDF files reinforces the link farm attack pattern. No scripts were extracted, but the overall structure and URL targets are indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://shuswapladystriders.ca/userfiles/file/ladofedog.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f903250156---kuxonazukorobupafupuwel.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375f284798---bewidunumotupefu.pdf
    • http://hanasushimenifee.com/uploads/files/90436232318.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a27a3497c6a0f9951cebf2526b7fc5d9/jopubivakesamevinase.pdf
    • https://moto-trend.cz/public/files/fck/file/97547487049.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e0b256819---14664123606.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c4642e87bd6aeeec90bdddd874f59b6c/botowineketobod.pdf
    • http://zabradli-znerezu.cz/userfiles/file/fotutatomudonebomokomil.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hnvnhgm1q9hsjn7krvd8b829sp/dovubutoxevat.pdf
    • http://sbnjl.com/userfiles/files/sesuzageletelusudiv.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86a4d285c---95707845625.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210516132551_80376570.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/33539c8b46d80fdf781e41887f970a4d/54299413906.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b4361a45371---zovuwomegoripelukoxadun.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rf88gclkdplagt09rpe7vkpgp0/15892623406.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085827760015---lixawiwes.pdf
    • https://x-software.cz/data/file/80711711516.pdf
    • https://sca-kc.com/scauserfiles/files/75106306338.pdf
    • https://graveyards-fuj.ae/userfiles/files/47489740428.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/625f8d72aef760251fb0604a8b878bc4/xudimuvomipu.pdf
    • http://poiskvod.ru/images/file/kevoxigixelagomenefigozas.pdf
    • http://ajivikafinance.com/userfiles/file/35570682457.pdf
    • http://struttur-arch.it/userfiles/files/lavofonimanu.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/cnqsdd6b6q6tnpo9gp3t29g1jn/7309771021.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=peptic+ulcers+are+due+to
    • 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_off0001729a.bin
a9e9b1cac42bec2fd34d23e11914205935fbcb968c65ccbd69003714cb87b325
pdf-font-stream PDF embedded font (sfnt) at offset 0x1729A 10504 bytes
font_01_sfnt_off00018aa2.bin
489e8e54cd69b6f13eb6b4293d71f3be8c207291e80b8c896e4c6331ae5c78da
pdf-font-stream PDF embedded font (sfnt) at offset 0x18AA2 18368 bytes
font_02_sfnt_off0001ba30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA30 16792 bytes