Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72df9cda726241a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 21:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d25007b83234b8ed6dbe82b8af46d171 SHA-1: db97abaa249488f3d57c3ede0dc2846306ecd2cb SHA-256: f72df9cda726241a302eea1b4e94b485c9cea6ead37baed9c419bf5766b8076f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=metamorphoses+book+3+pdf+free+download PDF link annotation
    • http://ganteltechnology.com/system/userfiles/file/lisumutalagoxexesip.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/luxarulumoxeverikafebu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48a02e2ae8---73276155756.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97f9e0c71b---52027719967.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fad120f6b---96008745545.pdfIn PDF document text
    • http://alltechsro.cz/files/boxadofuse.pdfIn PDF document text
    • http://faradbox.pl/files/file/riwul.pdfIn PDF document text
    • http://grandfiltr.com/files/file/64611705901.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc379c9538---pofik.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbbfe864f---wazazetodajo.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/21790905924.pdfIn PDF document text
    • http://becucci.it/userfiles/files/japasekupelopakamosexota.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/jizofu.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/zopidiguwafemiponujewoj.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/30704985773.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c1f49e26---48630400345.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/15837997759.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/4t0mip6fd9834an8m4hle78nup/5542841047.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/lopujefumotanef.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/nuradarejanurezugosakusa.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3t30sflig0gem8nd0a5014fsl7/37177142614.pdfIn PDF document text
    • http://sns.hu/_user/file/zebiniloxefagikedewozi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c385a3ea5a---lijebogazerezoruwufubavaj.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/2489101570.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/30900920099.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 16988 bytes
SHA-256: 17e4cacba29b3d01c5f3511b5118ab8c445ee12829fd6e065dd5b5e1f9680c54
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 11156 bytes
SHA-256: 762189b82974f8dc1633a1f7cd653a2b4293589b11ae104d1994e6e2b4dc5f73
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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