Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74f5cc14d992c58…

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 20:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f215a147aaeccfddce80d15cb9575cd SHA-1: 8794a6495ffb486eb676822c0aecead3d90d479a SHA-256: b74f5cc14d992c58ccff971c7277f36d3cce736bab6becd2ea0a139ae9461a5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://voxel-avocats.fr/uploads/file/3461430465.pdf In PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/minewopo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/newipamo.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/58505860753.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ahu4siqco1gd2ct8f7p4dro7u2/vufaxinupugetupuda.pdfIn PDF document text
    • http://claphamtaxi.com/survey/userfiles/files/35075555202.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/ridodeji.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/d137b95eb9abdfd13f1d3c040c837081/xamowu.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/zafizikanopewabini.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/84250139998.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/23322873569.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/23027168065.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/mhrueijp2b6q36a1qj9dtkq5nl/2460884141.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d9ae50dec41e9e97761e7a7a440e7f93/vadokegodonegil.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a133fa407b---mukelokosalabufuvamife.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddeb7f4f8---38076034462.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/gitavutuxolib.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/2648780383.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/boziguwumubibuduvanafez.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9raa2k13pptj1petee0nec7a7f/77640972589.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/35970450842.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fd5935198574131ff21969cc6e8b02d5/51009055128.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/728b5a8115e13df53109aeffb2b5519a/lepepatonasekoluk.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/72924755352.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ucd982d0spikp3p2a8mfd7ano5/pevat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jig+and+fixture+design+pdf+free+downloadPDF 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_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 10952 bytes
SHA-256: 1b8c1d248405325bbfe3aa0be248ee626ba41c64d3f0067ead4e3338996e9b84
font_02_sfnt_off000128a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 17688 bytes
SHA-256: 2f6d806dc97bb5a4fe1ca15dce8a265c1a2fbc3e544c0f6915ecc4c575e800a1