Malicious PDF — malware analysis report

Static analysis result for SHA-256 286d2d2b80aee388…

MALICIOUS

PDF

95.1 KB Created: 2021-09-06 01:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db30df0dabfab8190b4e916345606dd7 SHA-1: b56e95cc528f2b027b8c02010567c32fcf79e844 SHA-256: 286d2d2b80aee388056bb082d5a6ce1bfdd6fcc98369c6ca704cec9996bea9c6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=types+of+informal+fallacies+and+examples+pdf PDF link annotation
    • http://sumisaedu.com/FileData/ckfinder/files/20210903_D9ACC367991EBA93.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce659730f---zasexaratawulipurujavetex.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/79482697141.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096a7c25d22f---28242933751.pdfIn PDF document text
    • http://fitviewer.de/files/file/38213256280.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09e68d036---91715556003.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718227cb188---1972377944.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/afd4ee52d2916bc06d16e96f8ce11c91/2110585478.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a4a15aaad67f6d1d2b75008a0c4ad7aa/kanomafuxopoxuzuzotamex.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/zikobadipofinupopij.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/pixixef.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5237674016.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/25338476035.pdfIn PDF document text
    • http://proart.by/media/file/12298093191.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/jagikafijerixitije.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868023420c8---51483931656.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/megabofosonefub.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/44e2219318fb8171ceaa75054f56ab67/70872127340.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7908ca947---fobewegabiwobini.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1e7fceaa3d9fe97bab17436ba4f429d0/66402762468.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a4b1c7274c5331361722ea3dd5669262/jetepud.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/9818077087.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/kiponud.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_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 18384 bytes
SHA-256: 4cf42722ad281c21480d16eafe8a6cb2da7b4d63d27b724acce159ecd8cef928
font_01_sfnt_off00013da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 10864 bytes
SHA-256: 164ebbe92a79ea7cb1c9eea0a7560a3ce89a790aae1491e5857f0d9774840323
font_02_sfnt_off000156bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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