Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c3f9a55f37660d…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 01:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d90828b08cb8759d7a2d338be26bcc1 SHA-1: 2914a46a7a4fc2a6d5f6c971380ac40359d86927 SHA-256: 34c3f9a55f37660deb4a3955b8f03c4f974b9e0cf81bc2cdc2a77cd55fdf95e1
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, directing users to download and install software updates or extensions. The presence of numerous links to compromised CMS upload storage and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest it is designed to facilitate the download of a secondary payload, likely through a browser exploit or by tricking the user into executing a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=download+and+install+the+adobe+acrobat+pro+dc+free+trial PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ba5a6f0908736fc30d1f707b3fa80c45/vegivogeji.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/34546254551.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a9b0a55a4---31874330737.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608091dcb1b5e---pozazibidinazikiwi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f49f4d508c8---vibimoxirogipiwopelim.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/fb85a68c94e3ceb7d8cb909b823157d3/detozamenupewuritoripe.pdfIn PDF document text
    • https://electroagro.es/pub/files/jiboxeb.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/lamawoxiboxex.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/224fpasksqs85ts84pk6j44bii/guvadarimepirilu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e00e25366---35117056502.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/setem.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/80848179205.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/88747962376.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gomox.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e2e30b7d9032b2ae2a9606e746c90263/matufazabugod.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/21331220083.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/nagimepudipazajexuti.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1f8ee2fe5acf7b746596a2eda92b8f56/72414785648.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/77411316348.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a492d2402---lipiw.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/xanavelunutadaxobuvek.pdfIn PDF document text
    • 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_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 17104 bytes
SHA-256: 7f991bede05eee29fdfea4eb758a24dc88b57e0a6f91f350c55ad690bd3f2387
font_01_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 10944 bytes
SHA-256: 2d745b64517bd7ac8e7f0ccde0fd84a9b0722ab31c41d0876934ba99df967039

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