Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef8beb72854c71a…

MALICIOUS

PDF

82.1 KB Created: 2021-10-13 23:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 475da0e69e6b1dc611c0576c9c52516d SHA-1: c66d80fd09f15763f02f83e770fd12fffff7879b SHA-256: fef8beb72854c71a23ac6ec1b1db05a9486f089cb7b53134cd68ce0f1a685f92
204 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a browser extension installation lure. It contains embedded JavaScript and numerous external URIs, some of which point to compromised WordPress upload storage, suggesting an attempt to download and execute further malicious content or redirect the user to a phishing site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/5973716046.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135190c33d80---kelojefojaw.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210916174348.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/59783827402.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/24137011970.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddfcda170---82240098744.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/71564582220.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/sabijarulebepoku.pdfIn PDF document text
    • http://neteyes.eu/editor_up/dumexitaniwebota.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d455a86b---xunogab.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/59297142057.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/24846221991.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/zajagatejuzopikularuromex.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofagedazarosakegikewulo.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/ramoda.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/48770513350.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/23313259472.pdfIn PDF document text
    • http://labotinnghia.com/img/files/66982439562.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/pizegigifalokazi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/16398368974.pdfIn PDF document text
    • https://orrizon.ru/images/file/mikeniwomorezexulel.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/88367658931.pdfIn PDF document text
    • https://pecintajp.com/contents/files/logirusoso.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202192302419.pdfIn PDF document text
    • https://5udua.com/contents/files/gadagubomirananuvopog.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/15663328679.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=square+font+copy+and+pastePDF 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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 17260 bytes
SHA-256: cfc1a3f6dae0806041c3850da1de32e8b4644034d4b644130bfa593e0a2e90a1
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 10908 bytes
SHA-256: 5cdce2984b29b98284dd4fd70e20a77acb80defaad0a7cbd98503aba8ddcb9da
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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