Malicious PDF — malware analysis report

Static analysis result for SHA-256 d686abaa6bb1aa5e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 01:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5cd160f6db831c561e48b7d1ca8b481d SHA-1: 3af6a67814a13df26a9b680bca31d9968f85b0ea SHA-256: d686abaa6bb1aa5eb83ee3c795b90b0e37a5aecb382c5366a6da7d8f3b33e80f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to facilitate phishing or malware distribution by redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://connect-event.fr/ckfinder/userfiles/files/wizinimolijobekoridifumub.pdf In PDF document text
    • http://speckletrack.com/update/editor/file/ruzanuf.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/26949832545.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319243d6452---dabopubumobatufiruvuraj.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136fabedb469---wopaset.pdfIn PDF document text
    • https://asi-filter.pl/files/file/89018164517.pdfIn PDF document text
    • https://orrizon.ru/images/file/73853893185.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/godoguf.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613928c52a6db---19256083866.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/74128439432.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c210946a4c08421ce25862c3e315c8c9/45326845416.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/40421967726.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44919491968.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/ronexaloziwona.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/80462254625.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/48947158640.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/50619822976.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/rabajalozitabilulul.pdfIn PDF document text
    • http://winso.tw/userfiles/file/sabomuxoxesutesezuzexag.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/butedekarifatozarovefa.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/tesazaxelakesesevisipolef.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/60946193485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=active+primogem+codesPDF 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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 17288 bytes
SHA-256: fb54f5158d94e35a650f57dcce5300010f557ad89f52f5a83290b877ab69b2d9
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10592 bytes
SHA-256: d524435b2d6acb7eb60f8d6ff30852acd714a8e0f0c57ad4badfc818e8117cde
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1