Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c156af2c1eb5bea…

MALICIOUS

PDF

94.1 KB Created: 2021-07-08 03:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3dc07811cf1e184373b6a73c26220793 SHA-1: eb07f88681672f06c8466f35c80de379f014afc6 SHA-256: 4c156af2c1eb5beaee6af4a4e0ca273e15574c35965c1eeb11e4c704896c50a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'cmdtec1qbj/teboxamij.pdf' in the document text indicates a potential command execution vector, likely involving a dropped payload.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca0631c9b---39560174011.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/f5gen775ig4uu1hpcmdtec1qbj/teboxamij.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/lonup.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b446b3e9139---sapejesojup.pdfIn macro / runtime command snippet
    • https://bnbcostaverde.it/userfiles/file/84251296274.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e00dc9377e542c0ac28b229b9cb56645/kimexow.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c3d79c21cca981b8b4c921df2074efbc/49964046340.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe25820ee---30083859648.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/liqslind4v3suemc1g06j8dnd0/xisepofejivikagonesir.pdfIn PDF document text
    • http://beiks.info/public/file/wifamewilefufapafutafagor.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/009ha1179ocoatpef2ohd0l3f0/dimojepomifam.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fimupudotegabetelaxezana.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/6c32cfe12885d44ed18871ecc18d564b/nurivitujofudam.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/15ceade22a60f30083d72420a47d81a6/devinawus.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/16172402039.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0kio75nbmb7u47jp6a0rj1vgk5/51715755661.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/28644416388.pdfIn PDF document text
    • http://teraval.cz/res/file/63801739521.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/22618834396.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6216ee1b30---limafevosu.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/wisolakokoz.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/79a1d8e5c8874ad50d6b523f7389bb1b/66971801822.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/pilopibibenabalosijav.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2ab96650d3b40936f2919016ea3d1726/41527199317.pdfIn PDF document text
    • https://verandapattaya.com/userfileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=stations+of+the+cross+musicPDF 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_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 18112 bytes
SHA-256: 0fc16c9706d2f5b7b1db985249551af7d3a1b0085409c56d1b06c05cbd3c8e3a
font_01_sfnt_off00013929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 10732 bytes
SHA-256: 6d581faf336cce88926b8ce9b4cc4d60953837156d863c3ea3fced5d108aaca1
font_02_sfnt_off000151a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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