Malicious PDF — malware analysis report

Static analysis result for SHA-256 255fc43ccf61559b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 16:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a33b287a0844732ef6388bdf1695eb8f SHA-1: b298ade27d7df466165165e0ef7502be345ef04f SHA-256: 255fc43ccf61559b25557bad5a1f5c68d65d1d43cc6aebee0249af4e7782107b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous URLs, including those hosted on compromised CMS upload storage and disposable hosting, suggests a link farm designed to obscure the ultimate destination and evade detection. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://egokituz.eus/files/galeria/files/40441182928.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/vewebibope.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/furagexeg.pdf
    • http://musorcentrum.hu/files/article/file/rolafavatis.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f46bfa7---51237696423.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc821979d68---52403182101.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b04ced061---munomabunakuxoredakumaw.pdf
    • https://mimpiindahsatu.com/contents//files/39093045534.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d22fcfe971f---kofukavekasefupurozazajo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160903d3c006b0---58186713517.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/27d84d1dfaa4ddc36014351d4f2275fe/63622107970.pdf
    • http://abwingstop.com/uploads/files/39263973157.pdf
    • https://familienarbeit3plus.ch/userfiles/files/jikutavalisezirej.pdf
    • http://ultraljud.nu/bild/files/98953261197.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8b751b6a---wokogitofesururuzoxuxisu.pdf
    • https://aduanaldelvalle.com/userfiles/file/96886161740.pdf
    • http://mywymc.com/userfiles/file/58549153955.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea455f634---43640224732.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/d293a2bda131d256de788a52f854eaa7/87470186320.pdf
    • https://thucphamtruongxanh.com/Upload/files/18643638442.pdf
    • https://cvsc.co/userfiles/file/9813942073.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/57198494907.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cisto+de+baker+no+joelho+pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/90622896749.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f3a0e219---62076461031.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be5f.bin
091c48dd56bb0dc0b47243ecbbc4cf8a6e38bd381a1e4ed9cdda69be9488e8e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 19784 bytes
font_01_sfnt_off0000ee29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16792 bytes
font_02_sfnt_off00010640.bin
45bcd596784ea7093610c4b7a5b3f49b76183403696332e0bf24174a6b6d3cb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 10988 bytes