Malicious PDF — malware analysis report

Static analysis result for SHA-256 387d80189555068e…

MALICIOUS

PDF

88.1 KB Created: 2021-08-07 22:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1925501eb1732186ae8ab88e7302172c SHA-1: 122dda9d407e9b535a50ddb0d109c0e0552cc475 SHA-256: 387d80189555068e2c4a2207ab80fb9f2f2e663e3f56277fad2327041bf9c0ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=firth+school+district+salary+schedule
    • https://dnsbp.com/all4help/fckuserfiles/file/91580499410.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/mulukodaki.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076204333455---junipuwepaxapewimabud.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d73441573cf---karese.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/zuzunanomezavigol.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077a27a37018---konifewibiw.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b845d673b03---goxapimawuwepinuwosisogiz.pdf
    • https://atamergranit.com/userfiles/file/nolixoranosomawizawuperaj.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/facf2358ec5a4b120f58651365bda427/10177118758.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210626091011029688sf29tj.pdf
    • http://optikametuje.cz/userfiles/file/43300519262.pdf
    • http://smartarts.bg/userfiles/file/bunidijotodawofixaponebeg.pdf
    • https://amblamy.ee/upload/file/barijav.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2cb78964---6524741490.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c76f28e140ffe44f22e7f205d395996a/luwido.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8c8bbee6f---92537260720.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/86157e100a3effae4d43a545a47294df/66936139479.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/susivepaz.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa8de84b4---dotulesuva.pdf
    • http://netpost.vn/upload/userfiles/files/60900339249.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3c59a3d9---xeburaruxur.pdf
    • https://imagebeaute.fr/userfiles/file/walezukegazujizumodupof.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ad20b6e379d---19758712033.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a09eca039---binegisusono.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bffb9bb6b9a7c4044d73885e54f1af06/63420217698.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/nusijoxidi.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_off0000f603.bin
2880b2adeb53b3bf3607757bd39b734ea1527f0df8e56e0376dc96432511c1e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 17008 bytes
font_01_sfnt_off000121a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 16792 bytes
font_02_sfnt_off000139b8.bin
7a7ac997a1b22d6ab2d42223f574fba829d96e0b841e06741d6411c539b6ccc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 10556 bytes