Malicious PDF — malware analysis report

Static analysis result for SHA-256 960fc52996868cd4…

MALICIOUS

PDF

90.0 KB Created: 2021-10-19 16:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 485783db3b0348e7238d30dfdceb8d4f SHA-1: 8b832a643d4b92512bb36262edc3f0976cb47342 SHA-256: 960fc52996868cd466b7b044dbcdbd6312f63f3c54862f758203f8f3f09b476e
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 for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or payload delivery, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://grup-insaat.com/userfiles/file/39270337697.pdf
    • http://fjzy18.com/image/uload/files/netamazudofigesuxoka.pdf
    • http://normel.org/files/upload/file/refukibuz.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161447faaee7c3---bolunubidulabazefi.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/92747578450.pdf
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/4487483623.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1616b90fdb7a48---29652761447.pdf
    • https://kingdom.vn/userfiles/file/66830758087.pdf
    • http://studiotecnicomartani.eu/userfiles/files/90028051834.pdf
    • http://vsevolozhsk.mebel18.com/uploads/files/jiwirituje.pdf
    • http://muabannhagiare.net/images/uploads/files/19842284841.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4c16e6665fc490fc7edfddf741dd8970/88122636401.pdf
    • http://hourinkan.net/js/upload/files/vikiz.pdf
    • https://threadworx.com/thread/admin/uploads/file/bezaxetoja.pdf
    • http://gpsputhuppally.com/userfiles/file/39392259059.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/30394508206.pdf
    • http://dailyxedayhang.com/userfiles/files/42087604278.pdf
    • http://vsrru.ru/userfiles/file/nobevuzakovekobovozavozon.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8682ae9f---lufowiru.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6191a0e01---doxatom.pdf
    • https://goodmix-psc.com/userfiles/files/tiberi.pdf
    • http://www.bongbansaigon.com/uploads/files/51663488840.pdf
    • http://pkpneu.cz/userfiles/file/jowenuwonozomexisomi.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=ihome+bluetooth+keyboard+imack+134b-wm+manual
    • http://pro.ovh.net/~tribuene/images/banque/file/6698388731.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_off0000f83a.bin
306dad0b396a34a3c67f3fe3b4b880cbbb70cb9495d90a09f60a7567c889c565
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 11288 bytes
font_01_sfnt_off000112b2.bin
a9f561f07f4d8cd2d7ce56bcdc81243c19de5e896c68bf957d0c3aabee2938fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 18392 bytes
font_02_sfnt_off00014294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14294 16792 bytes