Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08c68b1a6ff924e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 19:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdca1111bba1ebdcfd12db669f436de6 SHA-1: 409e1448c2c196e65d1ec1f679158cf101aa1890 SHA-256: d08c68b1a6ff924ede9d534e00f520ce44d452090e2bb707d97f57330fa8735b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b32c0e6aa---26130509613.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d85be9210---32255879996.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/dibuxemadanasunidu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50882299b8---58985760040.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/tonowenepeduno.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/mosoxis.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e044d0e61ed3413de91c70eaea0175f8/38052464613.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/53053734219.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/41487126429.pdfIn PDF document text
    • https://dineflon.com//files/pubesemafojuk.pdfIn PDF document text
    • http://armanetti.com/images/wutubudagotijibobemova.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/24506274711.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/62413523866.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/84478936702.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080fcdbd90b7---wovuneramexofonet.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/73323194972.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e981818812c62eb289082fba08a8dc8a/76465908231.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/82137494185.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/gonamuzop.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097026529ddc---3238592648.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/803d0583df1bbd1290966dabb847c47c/47635587228.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zomatakaruxezup.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080d87b30b24---18409026324.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b095499a2---35536544150.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/revibirilurut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=markdown+preview+enhanced+pdf+cssPDF 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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 23468 bytes
SHA-256: 04c67beb04f669352d89e2e70f943a0714b16cb0b553ce62036efdd0001320a8
font_02_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 10812 bytes
SHA-256: 0b56db345a852345b13ad04c624be0b6bba03d6b495070cc8d0ae53c68238704

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