Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0363708d61fc16…

MALICIOUS

PDF

75.0 KB Created: 2021-06-30 19:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 27cd55c5752be3abb759584ebefbe864 SHA-1: ed6f2a5b17b09773f1a1dbfc4172297b9c7e7fbb SHA-256: db0363708d61fc168ac194076ee441d3b45a926dad7fafba290c7b192f8f9f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://transsnabstroy.com/userfiles/file/bolowimifobor.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/191f67d26ad3a83542b6e7cf62469043/18170661954.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/79015051600.pdfIn PDF document text
    • https://fallsplat.se/file/poresadobemosevez.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/54180751560.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/73664633797.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/u20qfbld00mhd5n855ceiv87to/dibexo.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210616_014217.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/golozizabi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4b916f71ef201e5763884669b052451e/96425142909.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/sekijuxuviri.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a994198d4d---45124902452.pdfIn PDF document text
    • http://effektfilm.de/files/file/baxomatuwe.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/dowoledoloxobofogi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kce9np6n5pvscm8grceknji137/9080878077.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912b4713d88---tanuziwonarimupow.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab8a506e6---8043574600.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f744cdf3e---gejevolabap.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f58ebe035---livewemo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/63b6b5a2d6c54e992e942efa4f241e40/gesulofikog.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/75khkp9fcd7i5rt91g1fsvlq1h/17847450883.pdfIn PDF document text
    • http://novichiha.ru/pic/file/84769502917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=semi+riemannian+geometry+with+applications+to+relativity+pdfPDF 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_off0000bf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF23 11408 bytes
SHA-256: 50e9c3a2e51727ff301ec3c1303a168bb6a5d98fd62d678c4a0d861486b1b1ad
font_01_sfnt_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 17024 bytes
SHA-256: 7765c3de1ca424c19cad893195be8f04d445870485b69391d8df53ea17db158e
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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