Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e0daca3bfc30bc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 05:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 971633eed81dda3b4355bf62135095c5 SHA-1: 6092a3a153e50ea591f7bb640438cb7cf95fcffd SHA-256: b4e0daca3bfc30bc4b826d83d0679b6ea5b6f0ec82443af4c592c12881839eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://tamtamphat.com/upload/files/jikibakidaxazadi.pdf In PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/fuvomewudi.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/71534188639.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/63277502527.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/47794685185.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/josavilosoramej.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/gamokivikexupolisazun.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d0d94ca5a905698ef32b785652be7f86/dopajawigezizedejidezuma.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/20700180056.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210910105635.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149180891a0c---77357511743.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/68325855424.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/61645817238.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/toparelifowaram.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/nifamexolelep.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/kugigowanemodovarofeb.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/88448517841.pdfIn PDF document text
    • http://alptw.com/images/files/78612623512.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/17855637289.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e5b192d8f4701a71a58e424bab42d401/raxobegexefamogidujofiba.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/ramavisotafimuwaj.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/gufufipemirozolevorotufo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/736123d2c061534a2fd655844b66bb71/pagekola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=principles+of+economics+pdf+6th+editionPDF 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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16992 bytes
SHA-256: 29fab8e419fb7d415659e0e162ad29d1274aa872ee5461d2ea5ce81d5682da43
font_02_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 10892 bytes
SHA-256: cf61e0e73e4f58254d9670029016d670b38a77108069bc066ced5cee5e2d3366