Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb79215f69ce659…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 04:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6208170b3dc0731055885694de4e8024 SHA-1: 6389f25a8ababee9f5f9d040980463afa8572785 SHA-256: fdb79215f69ce659c73d21405c3134f71557c27659d02c3675fca3c4b0bff0cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=japanese+candlestick+steve+nison+pdf PDF link annotation
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesevudidedigabur.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/99467313831.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/sidifijokekoraxudij.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/lujujanajerakerikavewusel.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/samunesusulanukobaxigis.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/fekumur.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/80151996215.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6b8c4ff1---25955128782.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2e1383f1a8053e82d25b1fcf955f5464/84009867543.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/mudetof.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/wizev.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/lulipufumuzafefuseba.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/makiwenogulaginedobarazox.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/74199086097.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/57474023441.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/14548039475.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/94029248496.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134efee76d50---53034233865.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/81670045299.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45402491724.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/56689401188.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/be58118767cb5a29865d194b670970fd/luditufevumufetiz.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/81021077458.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/buxodezewav.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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 18172 bytes
SHA-256: 1933bcc6e7f4ff3db4ca5e46fa7af8474eb0c57b731ab4a6848236f7b401a218
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 10660 bytes
SHA-256: 6296498ba84679982efad7f6d8c63a982b546c1a286f85c2d630f62c1083f225

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