Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed204ca1c11b26c4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 10:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90e06444a61663c2c2409f05b0001d9d SHA-1: 2f5a253d831ca22715851ff99a05be52f890bb5a SHA-256: ed204ca1c11b26c4a6afd4c7575b820a1044ed096881f4d50699e4ee2c44b2a9
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=a+happy+pocket+full+of+money+expanded+study+edition+pdf PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/37b7b8aaad2e5728e662ad402c26423c/puruwewapabigolagixufu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/etq2pgk0s5f1cokqhaal42ijmo/58366280027.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/9qnfvr19upmotcpaussc7npfvg/24618119891.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/40118106694.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xojekebozifagutadu.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/jipom.pdfIn PDF document text
    • http://screen.by/images/file/96674213529.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/demadufugamafokovekitib.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/sikisukopa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607170d559f45---rujigadal.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kalojasawodijulovabaz.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2571f741---debalebejojidudati.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tnag5kgl7leqac93pb3v9rvick/fidorozegobizuru.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/78127350424.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a920b9a13---duxaligub.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/226f9792536518b1f0b716760a020b23/nivaranevikupamorix.pdfIn PDF document text
    • https://angkalaris.com/contents//files/48821187071.pdfIn PDF document text
    • http://turatabor.hu/media/72760229179.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/nadisuwugepasebu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12e2df0f1---botonifigenodemugerul.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc81176ca697f1eead085258028a2e4d/wonizetonivetatatuboru.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kusipudabubevuviw.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/vejubadab.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 11172 bytes
SHA-256: 78e1d6a1cb530174fdaa6deb9e36784fe2797ffc4046a5d185441c0960bf801a
font_01_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 18276 bytes
SHA-256: f61c61e90a824a940010def8cd0f71c155be126a4223f576d693f2af1f1e83b2
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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