Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5303e9c407f3bb…

MALICIOUS

PDF

92.8 KB Created: 2021-09-23 17:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec84782c5425f1d7c3381001747c73df SHA-1: 61a44d76326c223f717f8bb8a4b0e46f91cdae4d SHA-256: 9e5303e9c407f3bb1ce961d29f72b681361bd1b6d701678533b782cebe27d074
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The presence of these links and the overall structure indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://metamorfozyayincilik.com/userfiles/file/fexoxagev.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142518908a27---389908390.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/72964969167.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/58802872314.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/sawakadadoruwezavodafa.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l935r2d7o37vuj8kg186a738e7/notavutojokifulobowu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/386821dbf85bd04a5ae4e43666cac383/60070268959.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/uegr1qsir0ouv2tvusab0dqfgd/82266230774.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/kefizusatisavebotole.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/suzifegubofugi.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/51038691422.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/58436374899.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/6340882996.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/22042994767.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/nabofujumuta.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/gozof.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f721e7fb69---gibewubofajuvazofojuf.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/21499492920.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xunizipova.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/85563426902.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/59586567772.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/bidijowulogavaxozeguvo.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/toxipudulokoraluvegol.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/kamasoneselirufupega.pdfIn PDF document text
    • https://lazerom.pro/media/file/vobomujegulovajewipigis.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/70198267412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=conda+environment+tutorialPDF 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_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 18880 bytes
SHA-256: f304bfabdea177cea3b47c3b49807673e31f270758eb129c4a4569e9380f7989
font_02_sfnt_off00014db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB9 10436 bytes
SHA-256: 8e96516a7cdcb8fd1b774e57e966dc8806a19ab21d6a1fa911b1ebd38d1006f6

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