Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bf3e629bf1f108…

MALICIOUS

PDF

96.6 KB Created: 2021-08-06 08:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d759f45f8b871d395ffb3c2ec46e510d SHA-1: 77f7479b4b0706e69a7b8f531d1f14e3849193e6 SHA-256: 10bf3e629bf1f1089c10ff11002d3b62b7f43b99442395aa15d351e5fe7a58a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://bdaudit.ro/userfiles/file/52690692361.pdf In PDF document text
    • http://adaviestransportltd.com/userfiles/file/17030816357.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0si8377ia4vkccdb2dn63t174u/64726009087.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/20753369876.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/zenupifaweginuga.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afafc8a9035---gigimasupojijo.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/60830119012.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/64957994827.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/cg5svdu748uu0ogchtv2fpa12q/27098043554.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b8ae18c66---duroguguvenoguwani.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c753f9630e9---84394247925.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/mufajekatumosaxipidodug.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/leser.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f679909af---80249964952.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sanuzopebefodakofe.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/92862135274.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lapitepedudogibani.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/64161132926.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/rojoloferapazarup.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/bupavapuxudibenadixezisem.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/28a221927bfe2f9b9aab4c7b4e849087/roxowupugapolevulok.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/govaboxazib.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/mivomulawabadebu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5cd9984a4370ddb05cd007ac249a8d40/vosigew.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdd7420c53---wejofiligazokugavo.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/dezox.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d669efcf57f59ffe38cbdaeb0489c357/7355501275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=picsou+magazine+pdf+gratuitPDF 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_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 11076 bytes
SHA-256: c3dff37641b5ed8ad10d11538c8e176bef81b399999ae88cd147b477a559f23b
font_02_sfnt_off000142d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D7 18768 bytes
SHA-256: 420691ba8a84e17337451c019978746ef36699154f911900b73e9b4b9c2128d9