Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ebd4bec98809b1…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 20:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ddc3bdb4762680c92b3e70162544df2 SHA-1: c2f8419362c4cb19ea2c59817af48d939a43a34d SHA-256: c6ebd4bec98809b1df665099a4f603ef56fdcda4b9d72c04dad2e869ba584440
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

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://ikomsolutions.com/admin/userfiles/file/55702696881.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/vokeb.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ba21d778a5c21f2b363418a62222108d/90634748429.pdfIn PDF document text
    • https://geloracinta.com/contents/files/22166722490.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e955a81b02---tenopowovovuguzur.pdfIn PDF document text
    • https://service-panev.com/userfiles/50189661059.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/74734603746.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/43684010397.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/78220981851.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/zukemus.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/namosawufun.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/medub.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/wesirirokusakologaf.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/bevizotobevinegalod.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/7493364322.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138865f8f5b2---nisinifeg.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/78033532683.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/61248358453.pdfIn PDF document text
    • https://negaratoto.com/contents/files/begipab.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/82263915821.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/78237370215.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3faf6f3cb9edc012d5e3bd503a7c512f/sivexaraxut.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/50805767400.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/togajajexazuvopejotubax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=5000+followers+gratisPDF 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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10528 bytes
SHA-256: 1c4f07a1e61968417c29c6dde168179ffa1280808e7589f3c13be6de92de6dff
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 17456 bytes
SHA-256: f3239c2a8c3687e50dddd202f379c75b6dc9b1a943c498efe0c04a0cd1181eda

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