Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3b97a197de3c39…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 03:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5beadc32a92db8fe9549cb1b24854930 SHA-1: 17d21ecd82a135f6af6f91a61b0fa7990ffa54f1 SHA-256: ea3b97a197de3c393f0b5ed39112128c661833d0a6a983c4b4fd4e6519d1ca5c
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130367fdb327---31742037018.pdf In PDF document text
    • https://digiconelectronics.com/media/84501362677.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/vadodigetuxa.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/28619960528.pdfIn PDF document text
    • https://wecareprogram.org/images/file/lonotenapi.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109041653288006.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/falexivexifojuf.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/gigoze.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/xusuvupamolixafetapukuka.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210903_095424.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vozek.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/risawijosuvi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/35184545249.pdfIn PDF document text
    • https://actorconseil.com/files/file/wenup.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/92947429507.pdfIn PDF document text
    • http://vaynhe.com/upload/files/83779702631.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zugokagota.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/82273387782.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96829478578.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/38982463779.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8babd871---18965110843.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/faruloweva.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/54937375902.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161384d61b6d3a---67958185207.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/35100606208.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/ragedew.pdfIn PDF document text
    • https://salwangurugram.com/files/3441160819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+relic+runPDF 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_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 18356 bytes
SHA-256: c721f2f4987c32c66838bcd24740860024fc4e719ad8f90d3da346faa07f60db
font_01_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303F 10284 bytes
SHA-256: ed926f60243aa539ca360cbe4abd2607d831456341d3c766faa5f1012dd5e6bb

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