Malicious PDF — malware analysis report

Static analysis result for SHA-256 906ca316c71a3f9a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 20:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87b66f91045e8ab495a6809798833301 SHA-1: 09e8615d920e1963e734a368c219548d2b1f4309 SHA-256: 906ca316c71a3f9adb59ee84454bed5aa8d5a3a8acb78d327e29c9e2d417c8ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://h-p-n.fr/catalogue_dynamique/file/girebowuwu.pdf In PDF document text
    • http://ser-buk.com/userfiles/file/keladazajozusevumevek.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/wasadiwav.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/35916b28885cde84b4977052e2c18e04/74359876444.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/bexubazexe.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/20930556295.pdfIn PDF document text
    • http://infosierra.es/images/editor/40502816353.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8a770e63---dewenizonesinukosiwu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ce8d28d6---levowafipidaretavorujo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613827a9abb76---ropapajojiteserafomute.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/tajexizusulapeta.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/gudatiroxikagadu.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/68826774859.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/18720072577.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/61968229987.pdfIn PDF document text
    • http://arablift.net/userfiles/file/tesexonituvogixuwi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7d672bce---dakujubikazonu.pdfIn PDF document text
    • http://ruresept.ru/files/file/nebuduworeti.pdfIn PDF document text
    • http://greenglobepms.com/uploads/gakavinizatupibenij.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/pasubodule.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/72656900857.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/63099240158.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/19751588080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rosen+discrete+mathematics+and+its+applications+8th+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 17028 bytes
SHA-256: 9c8757ead94386757c7755f478f5bce2a21192d19a2d716eaa9f51d1349644b9
font_02_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 11136 bytes
SHA-256: 265920596f694259181155f2a3b1e500bf9f58831d55dc6dd18d8e537f788cd7

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