Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd88bc9a6bff542…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 05:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 501449d6db275af954dd3a4fbe304f1e SHA-1: aaa2cc252e279982beafa2d04e52415628d1b918 SHA-256: ecd88bc9a6bff54296bb5de4da5aed84d60f3b6206bada9c2e4a95fcb3181d28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://binarbaidtrading.com/public_html/userfiles/file/26536740002.pdf In PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/72704560067.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/41419463840.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f5ccd3771---zididewowaxukaxu.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/58920504180.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/gibufunalukuzudi.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/8929721375.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/151413306793.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/muvefoware.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132450563dae---turaxilezawodowigip.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b4b26fb4---37667151459.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/wovabelejebufuzek.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/36293797308.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/javobivetelizireboj.pdfIn PDF document text
    • https://ewt.cz/res/file/wopuwujizanarodogo.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/5880581604.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccebd50e4---55615266853.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/lifokuwexulejovakaxekeli.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/buxawukob.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/40168416835.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed815f91f---3481489636.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/55867028778.pdfIn PDF document text
    • http://espicycooking.com/files/file///sagogevipuzasoxitesawajol.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/54379588326.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/wijizusovusukowajobenafo.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/67041130590.pdfIn PDF document text
    • https://autoskola-scp.com/files/pinawazuwufotegom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mastizaade+full+movie+download+720p+blurayPDF 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 11508 bytes
SHA-256: f963218b6baa61db591e6f47bd423117b974f079b2c12a1c3ffbefb7147f3877
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 17492 bytes
SHA-256: 6b11524ae0e897fe11eb82146d28d1bc102b550defda63e18105ea469bcb9bb6

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