Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c70ee819630750…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 11:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 317ed4b1861942420c22f6d5d6c68cb4 SHA-1: 1909fa730c5f292381391f7497fea246e682128b SHA-256: 69c70ee819630750b2fa1918da37f30f489c92fceb73dbcdb71bb021ffbee097
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://tuning-zone.eu/userfiles/file/lezonoguriw.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/52357372175.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9eccf29c---xamofitifa.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/85856890423.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/nivizopajatopare.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/124596408461292784a4b34.pdfIn PDF document text
    • https://tavio.ru/files/file/5839130389.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06472db69---51641575062.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/dizex.pdfIn PDF document text
    • http://greenfins-thailand.org/uploads/file/redum.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/zenaxadesonigajunedipu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd1f73026---zusurasapumas.pdfIn PDF document text
    • http://cobmedia.hu/include/84259497693.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/bilod.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/16841150369.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lpbq2u2od82sk71d01mejieh05/24473726248.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/p3951rh0r44u784r9hm408s8s6/12948076622.pdfIn PDF document text
    • http://hms31.ru/img/file/selinod.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd95873de1---30745974575.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/492ed71c28f953264dba66b285699292/kavisesejusubasireneke.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/gavugozaletevobadikex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=end+up+byPDF 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_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 17524 bytes
SHA-256: 479c35ffd45bee483f85d907dfaef347f29c80fbc607f4848b648e220c259ec8
font_02_sfnt_off00014124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14124 9804 bytes
SHA-256: 8da3e4996ba77febd6068416a339831f33d6a640f2c54ba5c36857cf350f3785