Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141c9c2d20b4c01…

MALICIOUS

PDF

97.1 KB Created: 2021-07-02 10:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 144a3344d057ede09a5953799d3c115e SHA-1: c4609800237b95cfebb69475c4d09bf6d79a8098 SHA-256: e141c9c2d20b4c012fe5af197c30004d1fb9f87929cbcb58b68238f5d7288373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing or trojan PDF. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eff618f7e---wufutuvekafakelosud.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf0d599952---lezemajurilanefijabiniw.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/majal.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/45968893753.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3db0333ba022f54c6d6ccb2a43b5f72/37536614870.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/naruwazijaraw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f92f72f18---29048482370.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/56422723563.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/vasalagelifidojixo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/20535762706.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/46867751334.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/pisozesuwefu.pdfIn PDF document text
    • https://etimes.mn/uploads/files/wusabubodewuwubusuriva.pdfIn PDF document text
    • https://blugarden.eu/file/satar.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/40985240339.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/mafexosogakebifisosijaro.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g2pr19le3mqcs9guhaph3jr4ic/nobomajit.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/59182548602.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/1689530563.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8f9c06802---34307302025.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/12494595042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kings+of+the+sun+filmPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/surelorulopajudoburenepek.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_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 18492 bytes
SHA-256: a12108190e1e42084f6a73f2182734398ce376b687061120a578f14edadd9a05
font_01_sfnt_off000147f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001600d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600D 10488 bytes
SHA-256: ad4d68268ab6a6cb4c510bf0523bd26c117c712026cb1b8a4af59ee2bb50cd1c

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