Malicious PDF — malware analysis report

Static analysis result for SHA-256 def06037df100a8e…

MALICIOUS

PDF

122.8 KB Created: 2021-06-27 23:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79904a580c22cbce247a7c1f9119647d SHA-1: ae324309d6b801e28ca327c57a21a1930f1c36ed SHA-256: def06037df100a8e6deb2a7764762dc1d5948262e2c862610115f0c7d3a8a27f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting, likely for phishing or malware delivery. The presence of multiple embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to exploit search engine optimization or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://chmelo.hu/sites/default/files/file/58756106111.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32f57c4fa---11919274818.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/03e44ff078e62edef3a95b0a96cfdf18/narulowara.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd755352d3---50153612891.pdfIn PDF document text
    • https://baongochoa.com/upload/file/31778333660.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/foruxuxofalin.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nnkf7gj368qgti9ou1h6plclkk/48564205728.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2322cdec3bfd27dd0351b42bf840345f/mewuvazugovaxefosifotuk.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c06a528867fe8ab838c141d5cf1df93b/56635948052.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/d8c831848a25b54821065e77fadcdb9a/88662148287.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/xonotifi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0fcd8c02768c14fe319d972dfdbab032/47160587367.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc3c7a55---xigavovazumare.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/n5qnfbobtnuutr9ujvf5n9gt1g/50959700104.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/74216504481.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xovekakotavazewi.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/lodofikuwapinuxopagizizew.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e113f3602---pavazejimukaruribogemax.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079302e28519---91691035166.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/44684334317.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b2b07688dea6c6d19851ef2f5c5ac5a8/68696846374.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c945cecd95f---5240536103.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/55229412595.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6d00059813eae7ec098f32a35a96faf1/fuzebipeselotedizova.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/193ce86ffb4b959b36fb6d1a04ab03af/jujevar.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/69133941688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=obesity+and+metabolic+syndromePDF 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_off00017d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D45 10808 bytes
SHA-256: 610620214ccd0911c97a3e66958b033a10d61285dc956d91d1dbbaacbeee3874
font_01_sfnt_off00019639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ae4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE4B 18904 bytes
SHA-256: fb0211e8264d8a80f636224e9b175ed578f021728e5f5da39b1ab15f31c82b00

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