Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d9c295d3485ed0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 19:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f340c44edbdd51a44d5bb63b8ec51f7e SHA-1: 8bf18323194b880efb63b792e21350dc69e8edb5 SHA-256: 71d9c295d3485ed048751204f9f5af7e01f3f308124ac50202603ef24a18b76b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/532aa74797948a5d3f106fcfe340d952/34568465043.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/35791122605.pdf
    • https://equator-maritime.com/userfiles/file/85711454131.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/feserodi.pdf
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/bexenus.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27f201006---xolubusunujas.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee325c4d0e---xotudulavi.pdf
    • http://julianina.dk/upload/file/sozamiposezexoraxa.pdf
    • http://group-anons.ru/userfiles/files/gulejipo.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27900a608---92782109019.pdf
    • https://jokerprod.net/userfiles/file/vuzetidasiwaziwo.pdf
    • https://daquin-ferriere.fr/userfiles/file/tesexekoxatugegixab.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/mofunepebumedipopazun.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160848dca36cb6---31483403909.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1c9a8985---zowatitajetujovosisixu.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sunp3ln6muqckk0dsqq9acf94v/48367464705.pdf
    • https://nationalshield-uae.com/userfiles/files/sojele.pdf
    • http://biosystech.com/pdsFck/file/45632451690.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a58eb3694b95b18030ba6c88a8cc8bfc/forabibivozedepon.pdf
    • https://ludifrance.fr/userfiles/file/3623172266.pdf
    • http://bannails.com/fckeditor_userfiles/file/24095774289.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bab2d506e---jodelifuwijenamijurogu.pdf
    • https://allcreaturesinc.com/files/files/933783395.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e7e55cb4b---rudigebenopa.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/91741661200.pdf
    • http://halaljones.com/uploads/files/lezizuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ipv6+subnetting+step+by+step+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_off0000e745.bin
5866d9e7361ad8e429f9a87ec19a12626b52ddac08798914c4887ab669998ae8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 17956 bytes
font_01_sfnt_off000115d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16792 bytes
font_02_sfnt_off00012de7.bin
a82a67b72fe11bb33854ff249cbe4ab5d2dbb67db2f23f81a5d3a4e0e3aea869
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 10784 bytes