Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd949c7bf8295ca8…

MALICIOUS

PDF

92.5 KB Created: 2021-07-13 19:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 91daf3d38f6ce9f67d19dfdce386e04b SHA-1: 80c930b3ecd75305c8650b736375b48ecddd2390 SHA-256: fd949c7bf8295ca89757df3fd5888c7add9aaa856b058e4f3bf7029667304739
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=get+time+of+datetime+c%23 PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/jamijuloxiviki.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/090629ccd8dd401010b08a1dc1d13ecd/vopigatesabunofasus.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbdfeb662---nabiwix.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffe4bf307---kafidasakejipopido.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/46525972780.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/tutolamabasageve.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/gufiwegifogusi.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef83870fc5---pubufawi.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/9958769109.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/finewonofab.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8267c842---5356178066.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4976b73ea219af8539614693f244d240/bujewogevofewatujibif.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/poman.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a21db0b837156f8c73d835ebd20a02df/8447981389.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cbd6b649---74961284599.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b803e3a8172---komepenijivawuro.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160882a0badc4f---bunafepike.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071b665ddf25---jofekuminuredawofetitesod.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/30785863734.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608139d11706e---vezugiloluridukunivatiba.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/802f125f21db4d86a17482204464997e/xodarofejeg.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8cd23d5daac912186510636bcea8a6bf/sunavupotewomoxig.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_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 10260 bytes
SHA-256: a065390cfee6dcfef102479328b7360e7ef1ba6cd35d34b2e6cefadc1af5bdc4
font_01_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 18028 bytes
SHA-256: 8beea994d32c27664dbf7a7168e267da3c45b69ccdcd35710a8fadfc14be06da
font_02_sfnt_off00014b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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