Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d056f259d779a7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 04:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69c80ef4c35607fbc79e02f979a122cb SHA-1: 3114e0ed3171241041234c2f2fc3663104ffcedb SHA-256: f0d056f259d779a71a6cc26e9cc6d6f639fd6be2a333f0976623c80ee6685847
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sungder.com/upload/subimabujep.pdf In PDF document text
    • http://le383.com/uploads/files/64457318041.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/61204482405.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e3067f5434e29a092fd72ca6cd0a6ab0/lememosizu.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/19457613957.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/20202341975.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/33928983556.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kajaxafagixajivodewekuni.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/9681705719.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/37358419624.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/maminidumojanewid.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddf3cc1b2---12775671615.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lilef.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/68503116016.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915686ab59---56369480512.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/72815823734.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2ebec503b6c4f3d23243d2bdca159587/popegofidebofakidexasijix.pdfIn PDF document text
    • http://signauction.net/userfiles/file/78190072554.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/memini.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a818fdda46---lebexalevegusuginane.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/48593734767.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/wewuzavorenoxan.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/39161270334.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/jiwatepuvevewedoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+quest+7+for+androidPDF 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://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_off0000bf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 10780 bytes
SHA-256: 70f292f30e6e53955d943a13eebbdcdb74cba16ffd851b562c4739e15eafaab4
font_02_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 17204 bytes
SHA-256: 73ad519b8b93bb9f2e2e271167876a1d57ff6baf0a57a1da0cdeae70899ebe9d

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