Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef130247a41f0fb…

MALICIOUS

PDF

79.8 KB Created: 2021-07-01 11:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8b3d816e61b055788160f74bfce2b97 SHA-1: 2965be626b0d81497a7faccc90bf3e96b11c6452 SHA-256: cef130247a41f0fbed9292c3db646bc75dcc1f1c9781b7a6991e1ecf22ba6b1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5bb5418e7---bugakofub.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/sajazakozenajimuliwegef.pdf
    • http://sl-light.ru/design/img/upload/file/vazoxafe.pdf
    • http://armanetti.com/images/bivupifuj.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/008fcb26754a9c1ae0f1d55c45c88d7b/pivubulabiduvoxekomovojok.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6kd8ftfqh9g6r1ltbrarvbj3hn/30450984502.pdf
    • http://lycee-elm.org/userfiles/file/70794472197.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608603ade9482---xanexigaf.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae92223c56a---36280168894.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadc0f88111---30090977302.pdf
    • https://people11people.gr/uploads/File/rodopezoleminaz.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe022f02e0---73548296544.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a2fe47a193f30a410ae8876a79b94f28/rodiwegebig.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/odp4s6df9a8lsuh8seic479ca1/xatixosaxo.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/617e18be7d2c324649f85098991c7036/9632682187.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db559537ea---pasimisibix.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/270b5d55729815a41e102f25518ab68b/tizaxozone.pdf
    • http://simonhoirup.dk/userfiles/file/6812181802.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b040e6ef---72111773292.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n1s843sf6j77ob55le4g5aosr6/45272995114.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/kudokejijimosevoxojijuwe.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ecdad156b6305410552e94b221e7435c/soteduxux.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3da6b34235e07e61cc8175df95ab2e45/bebeje.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab1edf969---70596974237.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d413a477---68177923133.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=merrill%27s+radiographic+positioning+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_off0000d190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 16792 bytes
font_01_sfnt_off0000e9a7.bin
5a8e26fb90570d537412a4a55f4f63dace91441f1cadd35a33a71c961da133d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 10924 bytes
font_02_sfnt_off000102b8.bin
7964f90db0c657bc7c1e74ee80aa78be99a5d70ad5c1d3edf7a3af2deab049b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 17132 bytes