Malicious PDF — malware analysis report

Static analysis result for SHA-256 10577571867b37a3…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 05:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3ec4b282a0a6a28389c068d1ed64acd SHA-1: 0c3fb5a8e08baaf3a6f7acebc956ca54615d8205 SHA-256: 10577571867b37a3695b8a97ecf85d89e7e0617f0f1c647d7544f285902050a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://anduong-nhatthanh.com/uploads/news_file/88681408090.pdf In PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/metafagifajoravukexus.pdfIn PDF document text
    • http://school15-tyumen.ru/f/tuwelifokamenexuturu.pdfIn PDF document text
    • https://sanidom.pl/img/file/nulofokekofex.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/godalazi.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/salukiwuvo.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/bifutufuzupigogejome.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/15486351736.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/89418270521.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nibamobexawejitivibozosek.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/61947540936.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210906152449.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/bitewazut.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vatopekakubezigaf.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e069d5a63---5161795741.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/62576486267.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5lfduk7ekos4p82r1qkkbefj5c/wukob.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/80921cb3898ffe83e8ba84855a16bf3e/duvajomagivegisiralok.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/50cf471254808156d3c6fd396c45a2bf/wugokexafeb.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/wopivagimokabapisuri.pdfIn PDF document text
    • http://candientuvibra.com/images/file/75299063434.pdfIn PDF document text
    • http://freetds.net/userfiles/file/xabagorewijozirani.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/wubarebabowenero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fake+location+apk+proPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16396 bytes
SHA-256: 64c6c71c241b60c52d24d2680abab7cb5d93c1844a35a3f9fb6d951724045933
font_02_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 20472 bytes
SHA-256: ccdd4997785ff2d4133b47bdb6d17a27f7d696aafde8c28e5df4b646816e3d8b
font_03_sfnt_off00013622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13622 10268 bytes
SHA-256: c6ddccd7a19b9c019b9ffee6ed3984011b6c6ddfc7f3cc39b8ced4bff0762d0c

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