Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b79a4849fa95aaa…

MALICIOUS

PDF

83.9 KB Created: 2021-07-16 18:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 170578fa2181b4ab6f7a81bfe26a6720 SHA-1: d9ccaf959eabaa0129604b793c3fc0b7b7afd1e6 SHA-256: 4b79a4849fa95aaaa8d1b61da79310d8b033a925f1fd6033f8e5c6d383764deb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host or distribute malicious payloads or redirect users to phishing sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5720

Heuristics 6

  • 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
  • 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://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c598cc74---24870649925.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b35172410---29331998397.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085ffb9682fa---wisenigupomivowakobamuz.pdf
    • http://jjmcp.jp/userfiles/Image/file/tujusewetekagimisejuv.pdf
    • https://rubenoferro.com/userfiles/file/42474664693.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/96755356661.pdf
    • http://allamericannursing.com/userfiles/file/lebasiri.pdf
    • http://pitin-akutsu.com/js/upload/files/45904930762.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb550b972aa---47627520020.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b275a495d15---81709471463.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajipoto.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c24ec37b68d6b0a0e4afcc1f34247fb3/vitufegenegagazadukozu.pdf
    • http://altaprecision.com/userfiles/file/niponanoxanimunogew.pdf
    • http://aarogyamedico.com/userfiles/file/56649439492.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/52a0db0efd65c82853385e0cfee8eb77/saxeremedazomi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fd1bp78nssc14oa1pqjpnnuj46/95901359266.pdf
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/puguki.pdf
    • http://hurtmar.pl/Upload/file/bajewejuxibujugogivez.pdf
    • https://clubelsendero.com/img_pag/file/23083528795.pdf
    • https://charlesstreetvideo.com/userfiles/file/wadujevowinegiw.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/tuziroselemomovem.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607590c559532---10346397774.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/198bh614q55j4r8ivl151qurt2/27635732673.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ad3a4ad265d58f18eaf302b7571dbc11/zetini.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1u0m2e60jjq7rmnna2ehbsokd3/79876501053.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=realism+theatre+plays
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126ae.bin
bfc0cd791fdd7dc3a70d5b378b120d06ed9ac9a8f6b2ac72231c6e419a4d9ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 17188 bytes

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