Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08d05e2acf7d058…

MALICIOUS

PDF

94.1 KB Created: 2021-09-23 12:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b5f187fbd8b33a2bdea7796e9c544c4 SHA-1: d45f6c22dc8d5b1819865a391205faed62235081 SHA-256: f08d05e2acf7d058a760d7425e8bcd10575c97ec52847899bfe7a5453326def0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://leicesterbiketec.com/userfiles/file/15243514876.pdf In PDF document text
    • http://na-bytecek.cz/UserFiles/File/zozepufedebitogewuga.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/nekurefobemati.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/78139655715.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/batelar.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/60900972267.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/dajasavorabevu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/28899482042.pdfIn PDF document text
    • http://oris-am.com/editor_up/jimavi.pdfIn PDF document text
    • https://jurad.eu/files/file/fowefi.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/nigumipoxurevomikesofi.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/7351996933.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/sedamuwovikikaxonoved.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/38383266344.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/13247407510.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2439ece5d---48522363668.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109221950188644.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5427336e125b3cb102adc2f28be87de5/68338492836.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/80964404123.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/josilofuxu.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/88871420466.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/gidetelokogib.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/49633839086.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/weruralude.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c194c7c74---lizusomukebijepozafepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+hollywood+movies+free+downloadPDF 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_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 17356 bytes
SHA-256: ea311251926ebe5870b17da8903929acfb8c9a6cb125c5fc637c0389320b00a8
font_01_sfnt_off000138ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BA 10936 bytes
SHA-256: 33b0fc34a72427c6bb0c38d771a42305b3763cb1dbae2b5cb4c92f6deb9a7f9c
font_02_sfnt_off000151fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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