Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a69f65ac87d25f1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 01:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e8196d162315bddb97430228a9e8836 SHA-1: 20f3ac7bdb672d483891c410362c7f169f63eeec SHA-256: 4a69f65ac87d25f1cf59465b80146ee088278f4425f263463e7051197ca84409
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF documents hosted on various domains. Heuristics indicate these are part of a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/41546eca2aeee8663cc2e36115e5b01e/86666705508.pdf In PDF document text
    • http://bociany.sk/media/file/niduxuwebupaxodowibak.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/lizakufelizirewupuxazaj.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/fezulalotazofo.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/xozopopafijelepi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a62cd8bb---posedowujizomeme.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/ledulomizonedapes.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/wodulonubuwavowij.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/teleg.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060608562849.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vomevavefapamov.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/4654683335.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/87729451084.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a991e633b28---12751730768.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/372d397a8a1e06491df186f2e2df4670/burejebet.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cd6db98c577418b602a111b01a06d5d/2466934529.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/zuzuzezabomisutobus.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160742b5d4f32c---puzomeroliganebekobeb.pdfIn PDF document text
    • https://ccskin.com/geektic/files/lumulilixuwumapu.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/pinamixilapiga.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/62775692942.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/xajulibegaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tooth+and+care+dental+clinicPDF 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

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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 10264 bytes
SHA-256: 3394629b5d21bc4a0750a3f22a86d83367f0281f9bad98960566037da1d4aa66
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 18448 bytes
SHA-256: 710e8bb961464d755db6dc210fbe53c3567da42c09ebf4182cafc684c5171680
font_02_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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