Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da8335070d5eb68…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 07:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 26b15fc893e725ec3fcd203510955a27 SHA-1: 0d65851d3b6bdcdcf3cbef9f415861344469ea80 SHA-256: 4da8335070d5eb680f22c8c351fb2cec13d93231d9e44b7301461ad645471fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://allytemp.ru/uplcv?utm_term=form+and+substance+meaning PDF link annotation
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8060787a---savojamabipakafuzapijaxa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7aa66112---levanuwevuribeguwozuz.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/57285421493.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/27914703460.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mefedemopaledejebu.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/9970691058.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/77381775059.pdfIn PDF document text
    • https://tepihtrava.rs//files/21301029009.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a143572a---pivumedoreda.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/zibekanorexiworuxite.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c752351ac40---ripigusipadotaponajezirin.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4dad04a94---69017552528.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/nabomelive.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/70820340176.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/omepuq8639fekjl6umslcsk2br/temit.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06e8482b7---vebojetebixopakuva.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ee722f13---59113410179.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/62281794849.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/fujamagade.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/37294567226.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/25936997302.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2555d8e40da5145d14537156f373b20c/48327654557.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/923ef8912c1f9524cdf172ed37d31d05/88874879097.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dd41c140f---xilijebunixoniluze.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_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 10884 bytes
SHA-256: 2042a8893e0ace73c6129532b017bcd6d8f1232e1d82100ee18e6a611a7f12f3
font_01_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 18384 bytes
SHA-256: 2936dbed84d27f52e3788be20aef61b18c9f812ce78a26f9b531aabd2e46791a
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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