Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd919d8a76b862ec…

MALICIOUS

PDF

87.9 KB Created: 2021-07-29 18:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5b5b85f1fe1817d7bfd4a38b00221dbc SHA-1: f41dabf4ad6f5caab26d81c913b2311e88186827 SHA-256: fd919d8a76b862ecc6c4c486a572615f7963f1afd16b2ac44c4f8a52736c56c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted from this sample, but the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=how+do+find+the+nth+term+of+the+arithmetic+sequence PDF link annotation
    • http://stauarchitetti.eu/userfiles/files/20720978601.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61664753738.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/43249274777.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/vawojazabovoninul.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/xovof.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160762271986a5---71793889529.pdfIn PDF document text
    • http://sooclose.eu/upload/File/tutodokaba.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/eb4d37eb5f5e4ba2660dc191b90a5844/19856359382.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae640529aac---324670619.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/83885350577.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/52245749776.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vogebivage.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/ruwavirugenelazobaw.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2909e8f3---1196738962.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/kutapudowojirovurudo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1073e165---bulejejodurokenawekus.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r5qr056c9gghuim2ukv4rab4l6/31664420357.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc015da19---xixodixetuvakane.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071893a32f47---72803602024.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc263e0f24---suriwelazilitix.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2db78ce84---jibibufikebo.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 11016 bytes
SHA-256: 4b2831b908ea8a64860d90a6082fef9ea5f18f2f9e30e022dd2f14b627e9a414
font_01_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 19808 bytes
SHA-256: 9aa0ef4f90634e1a441d991bb3613b77d18a0c50f8def05fb0a0459006e2996d

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