Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cb8bbbd6c761b4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 11:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 21efe5455be2d4f897418f03ae0c21cc SHA-1: ade405aca300f5e3117e2d9baf5a69dde4ba5659 SHA-256: 40cb8bbbd6c761b4d4b715f061bb49a3e6be028e6a15179bb8b6392d1522769d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=pressure+vessel+fabrication+handbook+pdf PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5b17dce0---pegerunuvegebipore.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/pobuderekokosenaxigobafa.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/90270052472.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/modosizidowegod.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/tefudununogagalakopeperit.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861b9aa2bfb---kiwijomulaxivig.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jeminexilukidirilamefiw.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/imt8n50uc3jh5anhkkfa3u7t67/vikulisarogopava.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0qilof83onlsjkiihdgbmcin2v/19465978076.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b186e2f015a---zezuxiguzilak.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/jofiruxoti.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xodiwuninofuxanojodozu.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/38014596417.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16271165542507.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/78355956751.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vexom.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/gujerotakiv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160875ecaadb64---jevudijawifipa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4de551da---50249667417.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/wifewuwuworilo.pdfIn PDF document text
    • http://kite-surf.sk/files/zuruwamujilepedorewupob.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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 11116 bytes
SHA-256: 370539e9ab4f97b4366cd22e8e23660f4eb2527c9c63a8fd9a20ed397f571422
font_01_sfnt_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 16516 bytes
SHA-256: 612c1ac93481a4e53f273b418d7b71adfa65dc10482c01fa67d951fc1798866f

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