Malicious PDF — malware analysis report

Static analysis result for SHA-256 f512dc7bdbe77c3d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 01:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e6391bc75e95a1d4a058cb2acf5c158 SHA-1: 8310e0acdb96141674bc94f2e7e512262d9cede2 SHA-256: f512dc7bdbe77c3da51e6ba44f3d25fc33b1a167a9cb2fc529d54974f2c3bc8c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as lures to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e543fc84---17828797792.pdf In PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/nezemesivebipulivel.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/malezabete.pdfIn PDF document text
    • http://letdentalab.com/img/files/97037555619.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f68440c99---jovepefatimarolote.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c8f4b1cd2---41111322558.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcbdd717d8---73330850457.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/juvinufudizenexuwazokaba.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/22393424321.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/lafefalojo.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/3237267995.pdfIn PDF document text
    • http://adveotec.com/img/file/22786508593.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078043f6e680---nonemagodir.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdd98cb120---gifenevimibesat.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd0ea24bca---49555010576.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/90727662261.pdfIn PDF document text
    • https://amblamy.ee/upload/file/74297736459.pdfIn PDF document text
    • http://briztravel.com/upload/files/galidilunawakasa.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/84757802379.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a663cac2e55---fenoloxubejizuju.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vowov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=perpendicular+lines+equations+worksheetPDF 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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 18372 bytes
SHA-256: 76f07e80f4a59b6c01eba6717526ae8fa84e80ed0c45a42aee7fc0f7503a57d5
font_01_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 11036 bytes
SHA-256: 9f7ba72a5fac0c35e2449adc4cf2e34a66e21dcd8d525b25ca296811d0be4301
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1