Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c16c47e54d612f…

MALICIOUS

PDF

77.7 KB Created: 2021-10-08 21:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d141bca9b0ce26c37ff572b38695e40 SHA-1: 0b3231131594858c1b3fc31f80f114974ac81dbf SHA-256: 77c16c47e54d612f4709df74ddb560ee2dd97cb59c43b38e5b70a792461705dd
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 or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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 https://netshopnepal.com/userfiles/file/14099040005.pdf In PDF document text
    • https://mr-alian.com/upload/ckfinder/files/padixakigojajuxip.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/majipesi.pdfIn PDF document text
    • http://handgun.ee/media/file/81086732631.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/xajazekufuxejenimo.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/junekepov.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/libobazuzofepojag.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • http://www.pvvc.cz/files/wukapolawamawuxa.pdfIn PDF document text
    • http://z500.si/files/9739700973.pdfIn PDF document text
    • http://recviem.ru/img/upload/79556542996.pdfIn PDF document text
    • http://net-marketing.hu/images/files/voxuwibiposag.pdfIn PDF document text
    • http://arucax.am/user_images/file/1689082191.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/rewusujiw.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/52718062103.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147110650faf.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134648ac22d2---71846524207.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/mapenuwibarak.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f7c753eba5---pudezigusarova.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/25564141991.pdfIn PDF document text
    • http://fond.ru/userfiles/file/mejipivu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ba1b89cf---88494017197.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161395913213a7---84776050462.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/lofapujifowizedas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bpt+first+year+booksPDF 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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 10600 bytes
SHA-256: a75def269cd01137a3a8d97184ae74d63ab521c852591a0ed32edf4c2afd0368
font_01_sfnt_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 16720 bytes
SHA-256: f268c478c214e107843ca357156081d92c236e110d44ace13da0ab21174dfd07
font_02_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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