Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f1059bc6fab75a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-28 01:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9bd21eeb8b219ec03e823eb73ed0e853 SHA-1: 610913aeb712e3d3d8cca95fdca85d2493222028 SHA-256: 12f1059bc6fab75a416340a2687081a9cb87c30dd0cbe473d6e5534018801205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised websites, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=sword+art+online+season+3+tagalog+dub PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614843006b758---17568531721.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/65537319872.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/94202313264.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/powedikutoxinivavimab.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/10273031260.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/dekaporabanutasinowubipon.pdfIn PDF document text
    • http://goref.ru/files/file/9482670083.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135787c34a69---munuji.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/surikibasitutarakotu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/jetutiwevozirenavik.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zitetewakezugegetizekilim.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/widaxosa.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f069639720---tinuvapegigu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/beo7captdu68rh6tdci7fi43ms/manikexiweranada.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6f4918c1c788e7d3e1a44e8bfe0479cc/4856388715.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/xepegujukivovegabaxuz.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/xukarokopuzozanir.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/56746376021.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/64702541705.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/sebevoxawur.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/35059576630.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/medejurakijovuli.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09e1bdf21---nugevumazela.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_off0000c0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 10996 bytes
SHA-256: 60053220bf07324a2eaaeed10ff86f1f83e5f3ed0928e0a36c35ddce00daa7ba
font_02_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 20816 bytes
SHA-256: d06bbd62cd4dfd98abc097c6d99e4697d79f712e524be1b2d22f5b026c13a599

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