Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a65ae307d0793b1…

MALICIOUS

PDF

88.0 KB Created: 2021-08-02 22:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71711f78e0cf16dd0b747e8d1959e0a4 SHA-1: 0ea7e2542938a18ae9c37112615109e4fa9a0781 SHA-256: 5a65ae307d0793b1548e42c281d511ece9c56a9d4232e94687eb872d25ac557f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hydrem.ru/images/file/39572827426.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/50520916271.pdf
    • http://letdentalab.com/img/files/22913515141.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8ddcb5a6d---23551765607.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/47135033601.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070026778593---rofixanat.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/72oa36bmjpb3oo0ep9rsggj8g5/gafufizavokiwotidawixa.pdf
    • http://aeronautike.com/userfiles/file/23495178433.pdf
    • https://dentalrud.com/userfiles/file/repunigirelawan.pdf
    • https://noticky.net/akce/fotky/file/sakiwisunirudo.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0r57uh3gpotvjfd2g708dbkjis/95970056914.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0693b60b66---tosabozojevor.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096b65a445---guleketanikipizamutaj.pdf
    • http://goozzl.com/userfiles/files/14007556445.pdf
    • http://goddesshair.net/upload/users/files/luduxenoxonemafu.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9270ad408fd82c192eb5cb4a9f3b3b4b/bigugap.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a09758d0---zejuwoxexibonos.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/94eae45a5bb875702937fbc82fe6f63b/93998607127.pdf
    • http://fratellilongoni.com/userfiles/files/pebalumofozigezabovisot.pdf
    • http://meetburgerusa.com/uploads/files/rujul.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd1607a041---mefuforibapexin.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fca57347---49031551199.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7gj7gn3u8c9gp9s13b1sghb8u3/manezigum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=exercicios+resolvidos+ciencia+dos+materiais+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_off0000ea4f.bin
e9a84432472daa90ae38742771e9c48d90aafafd0cdf3a7d9f1d5573f306a9c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 21432 bytes
font_01_sfnt_off00011e17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 16792 bytes
font_02_sfnt_off0001362e.bin
d44a7f792ca37d79f8ca28a170a125066c665d3ba650d62c75a0c299c09f6adc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362E 10932 bytes