Malicious PDF — malware analysis report

Static analysis result for SHA-256 931d2faf360554d2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 23:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea794fccb4dee6dd844a75140021835d SHA-1: 087965d70c784c790d3c8b7c574de1e88fec546b SHA-256: 931d2faf360554d24a02cd34fc68c82a1660911974367c1f18d524030a4369ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=go2+bank+apk+download PDF link annotation
    • http://legalinet.eu/userfiles/files/bisofa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d20bb5cbc---355586649.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/22159621276.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/81462112799.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/49728456993.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/88769954277.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/5071612538.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/96463997264.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/tugebinapi.pdfIn PDF document text
    • https://value.ae/userfiles/file/17124846975.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/86035868716.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/53233720263.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/gixojikonezozeg.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/futedezovatulokazexe.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090620030073499.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/woxobafujutomolaxirofajoj.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99bddc2ec---53259669496.pdfIn PDF document text
    • http://519pf.com/userfiles/files/rebopajagonozeredum.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/podota.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/xigerojobowajozikexu.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/xinalipelaribegekuwutalil.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1a0d83bafb84d5533207f9693cbc0acd/23154282858.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/zuzibogewepejiremoj.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/85841224752.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/pajolamobuxubi.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/xowukid.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 18320 bytes
SHA-256: 449d9c6129414a5010f3bd0ed291a452a4b77ffc0881812f537658a1cf8953cd
font_02_sfnt_off00012be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE0 10272 bytes
SHA-256: 2ff588d8d6976f8eb232af96ada5f66e66ff20c3f39745c347dfa8791ad2f58d

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