Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67bf52935cd8f10…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 00:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8ad1d6522cbdbfd5053134c3412521e SHA-1: 035800d0a6a67ad7a1808cb20cf5cd70ac6ef60a SHA-256: f67bf52935cd8f10eb199dd055d2b3e3666523292d2216150bafb51f7e9f5d31
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are associated with compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

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.
  • 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://td-mg.ru/uploads/files/rakowoxozofizijorajato.pdf In PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xezobupix.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tosizitubomema.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cba80a37f7fe022919123205720fab04/91178990243.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210901_161559.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pejanipewavekakowe.pdfIn PDF document text
    • https://dintek.eu/uploads/file/44805786162.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/39958819898.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/venajum.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/88434356163.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/fiderifafudugosulip.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/51425996154.pdfIn PDF document text
    • http://suurelepa.ee/data/file/53202586387.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/ketisa.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/limopuwilonadagusulaveko.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/lanoninobonoxomuxaw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144e832a7dd7---merapugu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613860823debd---kifovifukoge.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/19754141683.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/44414846494.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/54110543543.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/dozed.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/kuvuduxetereb.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/64139600894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hacked+rpg+games+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16428 bytes
SHA-256: b040613541a96ccbcba659c76550c35bbcd6a26c3668c32a96fcbad7361da57d

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