Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a29507a5ef33cac…

MALICIOUS

PDF

89.9 KB Created: 2021-09-23 17:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 402d7b814877d34766b97960e45af680 SHA-1: 96eb01d46e168e987cf2327ef6a56c9c848cc170 SHA-256: 5a29507a5ef33cac327010eb481f92feaf3c07c43beefacc9488d3307a06e068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=the+walking+dead+french+torrent PDF link annotation
    • http://www.ih-consultant.com/ckfinder/userfiles/files/47671843385.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/34400090219.pdfIn PDF document text
    • http://samarthservice.com/userfiles/file/kajegavebutan.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/tetajadiriketajili.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/nepotidebegutij.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/43214473086.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/94144597002.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/rigaxur.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/38325004109.pdfIn PDF document text
    • http://linza-market.ru/upload/files/bamalarixijereronalenava.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/bibuzevatikupet.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090521510180554.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/zabivaraxunomotitokibi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/48458169013.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lefuroxefojivixaneludok.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0c77509b559ae838f8392f4ccb4fd26c/nijiw.pdfIn PDF document text
    • https://masukpt2.com/contents/files/xulozanewofet.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/236e69e57f0845dd781eb8031d59a7c0/44934309049.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/58440049293.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/litexelajew.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/38307588308.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tidipigijakawoban.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b01b514e3b455dd27ba43a3f90df68ed/97143784121.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/fefakewu.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_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10728 bytes
SHA-256: 3499b17a2db5053c7400e91001b3b013dc8c5987708f84268f30dad1a728daaf
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 19052 bytes
SHA-256: 22ef1a7711a0e5bf425e49b07401335741fbb4dadf2fc55f77a7caf8f0861054