Malicious PDF — malware analysis report

Static analysis result for SHA-256 38230ceeaab2131e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 06:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5453487fd70c55b8f9a81b64eabde1d3 SHA-1: bc9a81ddb3f7f9af90a79c7d62356a46829987f9 SHA-256: 38230ceeaab2131e1e109a46d2e7b3f11ee762259839f44f4e4dfcff2ddef97e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://massarentearchitettura.com/userfiles/files/61316695362.pdf In PDF document text
    • http://studiosantese.eu/userfiles/files/jumofivunelexifesetijiz.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/satesokujoti.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/60193131224.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161357535a934c---debanebob.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/89236961061.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/pozapekuxi.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/23105737587.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/48761858716.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210914_E27F2B196DE4FB89.pdfIn PDF document text
    • http://vucert.vn/uploads/files/midozedazenelibalimasufu.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/47647797961.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fekupajuvigurudidodojab.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zotunalorupomokigamatima.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rogojutaxilazuron.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/bozavidapopisosis.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3034b682---17715931437.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9252d16edf1a609eb7ecbef4b1bfc325/50530471724.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219141310326535.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/xejodikaraxiziza.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/xoxizuf.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/xewibumetumuxejeg.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/bamukufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+tell+if+phone+has+been+hackedPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF7 10924 bytes
SHA-256: b39aa9b4b41dcf3ec1a2fe1e35428db00b41272fdf06458034c103347b029e41
font_01_sfnt_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 15304 bytes
SHA-256: a21d8989162d156e35ebf7d424153c733fa3a6ab6db85391200928274ff99245

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