Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f1404fbb354522…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 22:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c5119b84f65773d45ed29dd480a12097 SHA-1: c061a428b0bf99d968ba9966745634f50483915d SHA-256: 16f1404fbb3545229d1a18e4d8201cd4c7b7c1420bee2ac2ab52ad10582e792a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The PDF structure and embedded URLs suggest an attempt to disguise malicious content as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=les+moulins+de+mon+coeur+piano+partition+pdf PDF link annotation
    • https://tortugafilms.ca/adminfiles/file/23335077322.pdfIn PDF document text
    • https://digireg.cn/upload/xivijaz.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v9lqpg5fap9t6v0m50iq11cjt6/12696148613.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/denoxabefaxosutovipuni.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/71850862115.pdfIn PDF document text
    • http://wawa757.com/uploads/files/72309751707.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa43035749---patasujedalikikakatekasun.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de4cb05a61c---kogigimo.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20218232335185261.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609039bcc1cad---9174060198.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5d415dc3e68455cfd9133ffacb80ee66/sepasekopuridawumuvanomu.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/42506388754.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/xaweb.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/59686885133.pdfIn PDF document text
    • http://peoplefoster.com/pliki/74439465133.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/65268601922.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/xalabojepuvimulegonemil.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596f8937c6---81653095926.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/45794827267.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/53189474783.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/ziwuzifabatigoxogavi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6dd0580e429b1a347af93d19409e2745/kogilevanorinisofoba.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57d74359a---78487487276.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/16274605112.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/11386238595.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_off0000c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 18864 bytes
SHA-256: ffed7e4551b36e9137879ede235a68e454bab3f3f6f86eee5c58ff3cb8c27b25
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 10840 bytes
SHA-256: 394d3460de24699b75651dae2fad418d9b93c21d1676b9e94b0834bbc81b05a1

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