Malicious PDF — malware analysis report

Static analysis result for SHA-256 309f12e27013ba0d…

MALICIOUS

PDF

67.6 KB Created: 2021-05-30 04:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 90612bb2c8e7c935daf67fbd34d4bf2a SHA-1: 4b7c662426dd387d2ad9ed4c4b02639421e8a1b2 SHA-256: 309f12e27013ba0de90a065a88fd7a68f5d183557c65a6981d72eabbbf119cef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social-engineering lure, instructing the user to install a browser extension, which is a common method for delivering malware or stealing credentials. The presence of multiple links to potentially compromised websites and a high ML classifier score further support its malicious nature. Although no scripts were directly extracted, the document's structure and heuristic firings indicate it is designed to exploit user trust and facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3a7aea59---27076057585.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0ee53b6cdc7df8cc2fb24420677536cb/lomagapekuremikojubus.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429092059175.pdfIn PDF document text
    • http://deauville.ru/files/file/75433287666.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1ede4bcc875516dad91a259645c2924f/11520837638.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/447121c451ece831525a1213f9adc2f2/zusemidojis.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kafegovag.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/visofomiwawafopegipif.pdfIn PDF document text
    • http://www.toptehnik.si/images/5566493485.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lj5akuvqntjcmp4u359shmnds3/gosamomukusomupifigagi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e5adcf8a298cdea7437824fd6aeca1fa/zukunapejimeforinikotopi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8f7bd7d7---85202966073.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d855eed5f80aa674a2f6b0db98e7cb1e/81791086989.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/47541131210.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8882ae13eb830ac8aac20d3f459f9694/wobiwasusamabedamasoguwe.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/60c7f54fa0ad1ec04ba6f06cbc647f03/2143295919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fb+friends+mapper+extension+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 5440 bytes
SHA-256: 1c896a23755bd001b2fd8ea0c6d91ca17f5ca99a4da2b90d4795cd94a7fb422e
font_01_sfnt_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 10660 bytes
SHA-256: 07ad6db0a74e95ad3203408393daf31e2a505573a93d433818150a2b5f8c7129

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