Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4a964a343539eb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 01:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb98dce09e8d05fb403374d687386dab SHA-1: 55a664cbcbcd6c2c1d861e441c9ae8ab4ddfb8a2 SHA-256: dc4a964a343539ebe21fc97ba9d0aa4704e3ed9023b08e69cdb2c75d5c75f048
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=mikandi+unlimited+gold+apk PDF link annotation
    • http://stellarvvv.ru/ckfinder/userfiles/files/18462197584.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/pufupujew.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/momosekit.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161411254e73f5---95359711043.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/99330367198.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/nusitesutawarogebasumud.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/88984928366.pdfIn PDF document text
    • https://rais.bg/uploads/file/94011076294.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8858937e---81330159806.pdfIn PDF document text
    • https://anfauglir.com/images/file/38871505374.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/vamekabosoxilop.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/3261361654.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161452a7c85b08---kafinarifeligupewegame.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/vupemitetuwafagumir.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d838dee317efad33cc3ae9fc4ab945f6/91741693480.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/zedezigorob.pdfIn PDF document text
    • http://guchen.ru/d/files/xibekaxanonafogibuma.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/takojemivirodak.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/96629808076.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ketufowojirudodis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2fa52f41---xajemaguxarezunop.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210908082454.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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 19600 bytes
SHA-256: f639df697a4a23d99eba5f1a9569456ca6027545de75edc7ee82cbcfe596ed38
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 10652 bytes
SHA-256: bcfdfb1a094c88c195051342822c4ec3f2faed9e758325d0e9d814ac23a60a14
font_02_sfnt_off0001279c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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