Malicious PDF — malware analysis report

Static analysis result for SHA-256 4346e2bdf36b6349…

MALICIOUS

PDF

81.9 KB Created: 2021-07-04 16:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 382bac6c4ce8400f8cd8bce33bc871a7 SHA-1: 870d004df911f01c7d1390e9edc49f0aca5015a2 SHA-256: 4346e2bdf36b6349094985f75f52308ed6e54dc67729d850a26c3036dd3f2abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/65ic1oend6entjis1fc7ase59h/biwikowaruve.pdf
    • https://isosklo.cz./uploads/dajudevusumigiwurojaris.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9216b297b---wupuvibomoroxuxi.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/16190320621.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609490551f268---5542394812.pdf
    • http://microcement.ua/userfiles/file/pajevipafus.pdf
    • https://alexandrapanayotou.com/web/images/static/file/tobezuf.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ulco7ftbrhsk81u5er3scvjve0/72462776564.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/efd859c7bb55974273ddbd286bcba8b5/kepibolusajoludiviridu.pdf
    • http://annandale1963.com/clients/69704/File/zaxijimipakejaja.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe690b8ddd---gutanusopibesapivijopov.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77255187c0---mukeriminepaka.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5222883---79844514757.pdf
    • https://bywuf.org/upload/editor/files/mavopada.pdf
    • http://yuha.be/_files/file/pibujiwejolejuxifotoxefe.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2ea65773b---ludefikikina.pdf
    • http://rotang.net/userfiles/file/povegixoburokatisava.pdf
    • http://smepil.com/ckeditor/userfiles/files/simuroxemanomamepekozugud.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/62360197748.pdf
    • http://utuin.net/files/fckeditor/file/dakuxus.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58953adce4---44863167003.pdf
    • https://muguet.fr/sites/default/files/file/98202628626.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ripple+price+in+rand
    • 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_off0000dd4f.bin
c3f6c26fd80185add28a9b0a6c536b636ab7a4fc4b889a310a7a129d1869b418
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 17672 bytes
font_01_sfnt_off00010bdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 16792 bytes
font_02_sfnt_off000123f3.bin
6c0e55e942747b83338b49ed628d53759ce40ce96d6630bc6f083d01665c8723
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 10168 bytes