Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b46fa230dbea2e…

MALICIOUS

PDF

66.6 KB Created: 2021-06-06 10:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5dd8a51b43c4f095a428a5c8d1b67c44 SHA-1: ca187ce3e8ab5020d5d19c7d7b1a520d426d3d1c SHA-256: b9b46fa230dbea2ea2345d802d4bb41069279dee4d775b987cb58a5e49ee0c7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=what+questions+should+you+ask+at+the+end+of+a+scholarship+interview PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096477580727---19999720069.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vitepomene.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/99255148848.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607003b37b203---jamodosag.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe20c3f4ae---kifiwulitebavolimumusuti.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49bb1f842---semumigodafosametosapilud.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/875daf07fa7380bb2df9c0f53aa73009/88534617795.pdfIn PDF document text
    • https://invest.pl/userfiles/file/59140561232.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c9d4f9a6---xuwalixovifoputozofi.pdfIn PDF document text
    • https://maisonforville.be/documents/file/pewavanoz.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/usbsmosgbh4k03huc9t4loe15r/78925464503.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8b94049a---javubesesulowulolodekiwu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/livujefazanakubisulox.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/sumosizu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f46ab7e2a---54151249488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 5700 bytes
SHA-256: c00973c9adf0ea406a9826504c08ee57c2ce0aa3e449b4ed57ed979d92458bc4
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 9772 bytes
SHA-256: 9aa9b5c99f75d388856ea5f5d754c6f0f00285cf9e3ba07a7b13441c78fb04c0

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