Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e76f22474507ce…

MALICIOUS

PDF

71.8 KB Created: 2021-08-28 02:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa4a759fa0214c7d98df3b98296b8a2d SHA-1: 41f4998cc060c8e944206b70b0912fc6b81dd878 SHA-256: d8e76f22474507ce6bcd17f6e7afb0fd7323330648f8ed33090f78ef74df8020
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/vesigake.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4593205704---856089281.pdf
    • https://anthonygillant.com/userfiles/file/58268662260.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/39ed79ffdd529297fbb52ad419ccbc0d/kelapibonadatetij.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad29c2742---minamekatajopodipapa.pdf
    • https://bhiringisamsankalimandir.org/userfiles/file/pivabulitixefonufije.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b185f8aad7---mipemezimexadekoteliw.pdf
    • http://mitroc.com/userfiles/file/90338125301.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/66933078184.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/rupikenupuw.pdf
    • http://iseveranscopy.com/upload/editor/file/waralosugopunovebixow.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9c86cecc5---ruriwufiratigixomoruwig.pdf
    • http://megalabsrl.it/userfiles/files/88028701448.pdf
    • http://kirakuramenandsushi.com/uploads/files/35046978025.pdf
    • http://studiodrago.eu/userfiles/files/75197982759.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tf4n3qfkntpo2kvgn4b44csaqf/22338295459.pdf
    • http://omgmediatank.com/userfiles/files/vupexapod.pdf
    • https://llibreriaha.com/img/events/file/xusovido.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3daeacaf---sobisoxa.pdf
    • http://rollfactorytogo.com/uploads/files/volofanumizesodixifizof.pdf
    • http://hb1004.com/userData/board/file/melatopufigolovutuwo.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/gadediwukalasodo.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160da2ac01c57e---xemirefutepizanuxegotinuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kill+the+boss+2+game+online
    • 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_off0000b992.bin
14e6d8f59f57274d5ec507f8e88d16ef42e341fa41ac64c1bd246b0103503a13
pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 15828 bytes
font_01_sfnt_off0000e185.bin
9ed832fbf749b35daef91dfc39f081d1a8eceb89a3636dd599c385031c770a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10708 bytes
font_02_sfnt_off0000f9f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 16792 bytes