Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a4af8bff3b4c78…

MALICIOUS

PDF

89.6 KB Created: 2021-07-07 22:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df454042a3ad819c71ff02db40f7fe6a SHA-1: 66b952fafd4285488e33a50d3a0d055f32e3703e SHA-256: 59a4af8bff3b4c789617bbd342e752112f3f0d223c76b3ef48b00cb35885ccc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=sea+of+thieves+anniversary+edition+free+download+all+games
    • https://festival.bg/fckeditorfiles/file/jofesipanabuziga.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uovuj5mon7kisvelli4cs4mh5p/wanix.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hmm5kukiq43g4ms3sjn5t5c3i5/dofijapepilulipipituvu.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/menivowolunomuputozi.pdf
    • http://aytekinpolatel.com/image/files/29661361745.pdf
    • http://agiusfuneraldirectors.com/files/file/12081674333.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/famomitiderijawofa.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f90e2cc62932fd075ce26c01c26ac9f2/11405828815.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b076c532241---3891157300.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b24b46ad0a8603691ce8fc65b9e7e9fc/77101049550.pdf
    • https://cambodiadriverservice.com/userfiles/file/finagenapogitosofono.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/wuruvaributadifevufenumam.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ada2bf5c9---kevuf.pdf
    • http://zonazero.es/userfiles/file/jepubiwizumife.pdf
    • https://nadinerogger.ch/userfiles/files/35168726740.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9954f4dd0a17d0e34185e59f3e5fe1c8/83649168470.pdf
    • http://kuppersbusch-center.ru/uploads/files/18282582091.pdf
    • http://reunionclass.com/clients/7469/File/73066035126.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/704ba256e97aba7edf942c218ad0adf3/nagapazisuwuwetakidivi.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1907b9abe---mezogunimomuwugi.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/j64fmeemcb5dchq8dennh7jp55/wobidadobituj.pdf
    • https://stijsr.com/userfiles/file/pexunoduvemisibe.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99b435a62a963f43d09e03fd646b946c/46711146987.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/66149941069.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54f.bin
abc56b4c66fd2f28008cad9644af41ab79c751a2582e2b8abca2d6b0ad4abee9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 11144 bytes
font_01_sfnt_off00010f03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 16792 bytes
font_02_sfnt_off00012715.bin
a05e46f2b58d396f9f651e466c77c2cb178568b456fa3f324c0b6f78409bb4a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 18244 bytes