Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a7c6bef55218a9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 18:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e47d2a7e1ea98d1aa62efd86bc291ed7 SHA-1: b0c1ffff495fb27e7733d64498591d509ace7c6b SHA-256: 93a7c6bef55218a97bfa6bad9284b0e9e3e2d704913739cc09a1f5684f6d13cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=essential+calculus+early+transcendental+functions+4th+edition PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02b9283a6---14883365267.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/11384127453.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135683e30e38---89489472034.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0tn5oh619rfhhiqbgih0u9oidu/nanusup.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109102017598291.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///55534971682.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/117416801.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210910065204.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/16610181663.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/245vu2q8j3opbuo8ad16khe6ui/63391893131.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf08d17233---25365233249.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/zuxudafunemilixatewejexos.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78481450634.pdfIn PDF document text
    • https://marosme.ro/hirek/file/metorolokamog.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed61c24a6---fitowojag.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/tuzavadi.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/vipalenuxaru.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/kinogew.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/fimusulovusifenevek.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/somubokalifugupug.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/48914123987.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/18435097806.pdfIn 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://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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 18368 bytes
SHA-256: e1660016e844d23a4b0ed8814484110ff99e8405ddbd7535d70e04848ccc3039
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10848 bytes
SHA-256: 612a5fe415f0e3d208156a31bfd87f1648a9548dd00ed0ca5a6c0402198583ea
font_02_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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