Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8038e4827ff04b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 23:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16473210eca447441f7c8d192accd8a1 SHA-1: 66545e532f89d3409b24f5e87821396555d93932 SHA-256: eb8038e4827ff04b0c98a7dafbfecd993e58d4f30a617a5afc8d5e2a1efb9ce0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of multiple external URIs, including those hosted on compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://aucordechasse.fr/vosImages/vejagibibekapejox.pdf In PDF document text
    • https://suncables.co/images/file/6374264556.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/78069938314.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/19954030827.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/43139885154.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/zagexexujuxaridaxeb.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/37860961676.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/89689888639.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/selijober.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078db2273391---2063452860.pdfIn PDF document text
    • https://susta.vn/userfiles/file/wiwonorijifudoma.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/lanosebatixemuwutazeluwe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad63a0324---wuvumijagamixiwalose.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/fisapenilim.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/xazetoro.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8dc5d312---goxupebepaza.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hidl84g3scehc40ucvl312q530/46802375645.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/tagufatelilipixefed.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/zelunokajapobodivunopibuf.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fopeboliwosavimulukasubun.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/loxapamulakelujuterur.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/mujukazelevukokofi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a6af8133e8bd34d4439667a84574f608/74466204261.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa2ee7aed---jupug.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///55980180290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=health+education+in+schools+pdfPDF 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_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 10708 bytes
SHA-256: 4fd168315ad499d1ddcb5c2d24a25f2e7487d35a833224567c64bdc7828f409f
font_02_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 19896 bytes
SHA-256: 3784f86082678621aff7b9d19b45d1333c9d0dd3f515c4302554855b950b17d6

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