Malicious PDF — malware analysis report

Static analysis result for SHA-256 26efb30dd31ef959…

MALICIOUS

PDF

110.1 KB Created: 2021-09-06 05:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df7955b6f177ccf0210ba0f70ed3b38a SHA-1: 2fa9463783bc06913eb11a4dec813c4b6e5ca9b0 SHA-256: 26efb30dd31ef959bb0022a4c7a02833fbcb08f9428769d2041b543e29212f53
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites, likely intended to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hitplus.eu/userfiles/file/44697620088.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd067dfbb6---58639877734.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/21353780787.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16100aa6814061---xubidawapisiwetimo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/suwav.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/880f0c723f59e88992a857b0da8df5ba/69511111840.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210603220334035.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/32357998845.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/20990477193.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/88970480353.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/1665488321.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/glr4c4bobcf1l4gu8b19qbdak8/13315380237.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/lemozizewefaponise.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wakudesixonoz.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/dowupogasukabifuzigarepi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1df76693e20c8b324955db85d0feb4f0/zuves.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/89169742213.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/ladimekunajesaf.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4rc4pjacei4fi98n2d5o2oldk5/zizufitukawaje.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a15610a2be---pufizazitevabejiropowanof.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22a430dab1---77885821827.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210813_135440.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1508352f8996ff220f1799d017ac5aa4/bebunowaben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+prc+to+pdf+free+softwarePDF 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_off000145a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A6 10660 bytes
SHA-256: eba5f533697fbe0d2e2d85ac5e105e843159e4bf53ff49d3c04ad159fa1a5681
font_01_sfnt_off00015e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 19988 bytes
SHA-256: c366607bd6b0a55b5f40fc1a50751924e33fbeec340a7c9356c8d7604b02d308
font_02_sfnt_off000192b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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