Malicious PDF — malware analysis report

Static analysis result for SHA-256 406c2113c4945b57…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 23:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cae5fc1ddfe53a418b1be67d62111b7f SHA-1: 8664ca89e9aeac71c1eb804ded667f13e3b2c9ce SHA-256: 406c2113c4945b5749159fea9dfb1e54b36028aaaa28fabb9cde527082692318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for SEO poisoning or phishing lures. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=happy+birthday+wishes+to+the+best+teacher PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4cfa99e43c048ca09b94071ce374a5b6/bebubisuwuvoguwinumimu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/546e6757a9b7c3cc8096e93530b23ad0/62189732598.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7db3f666835441fc05af1bcc334b2562/tikabunekevode.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/bimasojuxorof.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sogodulopazetolapaxa.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/73375505982.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/4169610131.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070db54aa993---varupokegudomonibewut.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4d81e440cdc5cac5c9bb6cfb1a63fbb6/gujolumewexedaxazaxopu.pdfIn PDF document text
    • http://vejwun.cz/images/nukisisi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-21/20210621071940892775.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b213be5bbb7---46506042859.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/tanijumototunexogijuwu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9324e02aabde3aa3177546eed834941/tevulalovigidetawurewix.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e1ecdc0a---17276124008.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/42762642624.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/79281305767.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/msgmbokikg0oh4i6ggj9e2fto9/musuja.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/gufegamukuboka.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/maledujesojilamezebo.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/jivomuzosabokenexefegurog.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f86cae581---gesaxugekede.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 15940 bytes
SHA-256: c118db435c8fae23cea2ca5211223b35138456978ad3c148c10907ef8d67b009
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10792 bytes
SHA-256: 30852c3d599f3fd8ddd636d10bd0cc196d36a016a2fc17b24f13c6081c5e5add
font_02_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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