Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb44661312318c5…

MALICIOUS

PDF

77.7 KB Created: 2021-06-29 23:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd32b19a03a90cf431afb911760f4b22 SHA-1: 536d091d68a2b9aa3d9dc704f6f6b361ac232c26 SHA-256: 3bb44661312318c554b7874c51abe21b54da014a456535ffa5e5f2be4720d9ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://infrive.ru/uplcv?utm_term=free+online+automatic+text+summarization+tool PDF link annotation
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fhltb4fsshge2vbgqs8bbs2gc0/bupagimatalusalototu.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/fixikunukidamilibixumilo.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046e48b834---pofilezebevudajowafon.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668e154390---20588888597.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608498a865a40---wegepevozu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kegibetokalijefelonifek.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce67357ac---mukunogoze.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/2366286741.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/wimireziko.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efba5dbdfc---82059616404.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/52670681002.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/6667338347.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9705985e6---26017792801.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a823cb1e686---gozepamukemudiwovuwul.pdfIn PDF document text
    • https://bamor.org/userfiles/file/bupijebufozifiliwofaniwed.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/22e00cd09a76b12fd997fde0bba47e9c/60147475448.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/74140456310.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vadejavovevuri.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/88416842776.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f182ac52f6---82533834794.pdfIn PDF document text
    • https://ckmandarin.com/uploads/pijevojizokogo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b3c942b783b5f48dff18a152aaeea690/34344730997.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/44875416181.pdfIn PDF document text
    • 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_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 16848 bytes
SHA-256: 962af5d403c41812709e983fe4b7f92a8b09f3bc678ae2c1a6c32b1f8d392912
font_02_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 10628 bytes
SHA-256: df01a0660cb2c4f9de7c0a19e32d43ccb709349b6a270993833f3b8986130088

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