Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ae598e930fb95d…

MALICIOUS

PDF

80.5 KB Created: 2021-08-13 06:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5124e5511e43620043c869becab624a9 SHA-1: f833219da47977d1ceabacf12acb5a99713a4c62 SHA-256: c8ae598e930fb95d47ec678c3c7f90c2e977005c5704ccdf2872b6719ae17171
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to phishing sites or malware downloaders, aiming to trick users into clicking and potentially compromising their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://garglob.ru/uplcv?utm_term=problemas+de+estequiometria+4+eso+resueltos+pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f74cc393---nutenorixiwerubob.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80e6c154a---lasatozijafelisadizu.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1998748aa---85217900246.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8b8b008eb5a61bcdb045f296a372eef9/wefazuni.pdf
    • http://palyavalaszto.hu/teszt/upload/file/powofetigi.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mj9ekngo88fmcp6mer9dtr4hp1/tizorozixegopekopesola.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/66153714568.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8nd0epc749obgj2jiqjf106197/75711973943.pdf
    • https://fanaf.com/article_ressources/file/lemisamumefewozu.pdf
    • http://sjar-tech.com/uploadfile/file///2021060806480732.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e6eb6071---vomolonefifamopepapowod.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a37ee52b5---nokafowid.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bmvhhhqea6vg9aj9l933pjoq11/laledasamarowegewedaxi.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/mabiti.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a896c9eecd1---61462707743.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a80dbd70478---dabanizugodazuwunivu.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc05296bee---gamisu.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/tajasotok.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9ea14c1fcd1c6ea8bbf435d5dc32e8ca/78755398953.pdf
    • https://pet-fashion.ro/mm/file/redid.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/kotisu.pdf
    • http://shinies.ru/img/lib/file/rikerakilivuwuxevop.pdf
    • http://bulgankhangai.mn/userfiles/files/kipere.pdf
    • http://kyanite.tv/userfiles/file/digek.pdf
    • 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_off0000d4bd.bin
7e05f94ff6bbb7c3ac880610314e8c0d380e8f6dde2d80c02873a54804445744
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 11020 bytes
font_01_sfnt_off0000edf7.bin
ea9ad80e869193cc6ab0a9d8ca8d0e25538f084b4f9348a69a34e5e43dca6bce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 17016 bytes
font_02_sfnt_off0001192f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 16792 bytes