Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e60f7932d7f827d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 14:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a0aa3e8eadf51c8fdacc3b2263b781c SHA-1: b225d93063d177994d2f6c2c48990d945505fc47 SHA-256: 5e60f7932d7f827d77de125129ac9b2fdece2c3ac2889b2a9258a1d7b59a1a51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://otelm4b.ru/admin/ckfinder/userfiles/files/fodedigejewifavaluf.pdf In PDF document text
    • http://lukasikgroup.pl/Image/files/dodafagoma.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/204712179.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/16436499640.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a2d66cec---62826429842.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/18786892090.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/14455601031.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wamiwuz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a632274a---20682136735.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/mijudemod.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ccf3dde9---rutijozuruwifewu.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/58175593389.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/pagefexon.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/92fa398ed38c79086ecc3c7d378c5301/guralamuleduxi.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/bebaxibijovifupizu.pdfIn PDF document text
    • http://healthywithhart.com/res/file/95264626292.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/83393168532.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/reralotarakivil.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b22217fdf5ed2dc69980a79a5b13253e/sukiku.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/kutiloviw.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/69099178610.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fomutevoxok.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/60669095495.pdfIn PDF document text
    • https://andrejc.si/files/file/44074449245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=open+pdf+file+on+button+click+in+jspPDF 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_off0000b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F4 10840 bytes
SHA-256: 7f89e26945d19bf416f5f8e9e6434ac0e22442da46cb6c9ea0961df89e680d7a
font_01_sfnt_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 15748 bytes
SHA-256: b5c860b72b0789b2dbdf2ebc974035e136459fa337fe3e122942840e680c15fc
font_02_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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