Malicious PDF — malware analysis report

Static analysis result for SHA-256 9568fe8bbc7fa243…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 13:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf485c588747ea3211cabe3370638c2e SHA-1: 9c95221f71e8e4060369daf3cf8f2649419cf754 SHA-256: 9568fe8bbc7fa243afdb6d85f9fcb93c80722e3cfa7d14d861ce14c9c585bbda
204 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It directs users to external URLs, some hosted on compromised CMS platforms, under the pretext of needing to install a browser extension or update to view content. The presence of multiple external links and the 'Browser Extension / Update Installation Lure' heuristic strongly suggest a social engineering attack aimed at tricking users into downloading malicious software or revealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=change+pdf+to+epub PDF link annotation
    • http://glovimex.com/uploads/ckfinder/files/mikituxotanudaviderawiru.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/tunivudir.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fofudipu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/pubesamodapobivise.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109161919448199.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/95053230767.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/livozejukanavawunirefazef.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/simepixiwaxej.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/89452638786.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210917041557.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/81783184169.pdfIn PDF document text
    • http://vln.nl/files/file/ligavu.pdfIn PDF document text
    • https://businesslife.com/content/file/bukobipiwimikuxavex.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/060420029288.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/jemetewodizibigem.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/siborawerowagiriwefinoj.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/dakivekivupog.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jewiroxezugalonazinizipu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea102b9a3---xaleloragorezuneradi.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/pawusurujumupo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161420899f31fd---murenilegelibetuju.pdfIn PDF document text
    • http://aven.su/userfiles/file/fupavifewopinanusezejak.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mowinuxoxubumositaxunoten.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/xotuw.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/20995420589.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/melosupadetetidolumusog.pdfIn PDF document text
    • 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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 10640 bytes
SHA-256: ecbbcd48b6faaf79306155780c91faf0a52ffa6deb60964f7c8b3efd746bace0
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 17548 bytes
SHA-256: f74068ee3bf1c1b4333cf032b45fb00e71523f0d5cb49bc25e1a6a031555a77e
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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