Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6b2b08fb18e454…

MALICIOUS

PDF

85.1 KB Created: 2021-09-22 22:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54feea7c7ce002c7efbf0494fd115564 SHA-1: d7e5ddbf8607154e1fcc9762e316e73721622889 SHA-256: ea6b2b08fb18e454a5fb1bb3f2e667366fb86b6ce4e1eaaf14b8cc5d847cf203
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mijn-nederland.nl/userfiles/file/17226396796.pdf In PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojaxizobowixukopesiteti.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60506017693.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/nuwarelovuvidu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147dd11b4669---82654049066.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/zeweloxesofotun.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/zitakipuxix.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/kekelakamexebo.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/bajazojigukugomuv.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/50315756992.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/guxorobu.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/tixifowuvepirejow.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bd2161b92a33c3f854b1f898a89ca956/21638212644.pdfIn PDF document text
    • http://cascad-trans.ru/files/tegofagiputep.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/gilibasir.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/xufiduxopiboralenef.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/60146808419.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/dozonevorugux.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/75455561832.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/xezaliveja.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/2449740165.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vp3rblb8ijotb5f5qk2ij3kkba/48106981320.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dojiginajomevera.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5a2d3b06676a4625a3319ce76df7b021/13225344412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sudden+pop+up+ads+on+androidPDF 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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 10416 bytes
SHA-256: bacdbd25b349fe44c0bd002dfc02da7a102fe54f4f26eccb41b883b8fb5a73f4
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 17668 bytes
SHA-256: f0beaadc32ee0d796c486ddb9b5b28d0c9ed60fafd087c2e0cafa9e9ef3fea3b

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