Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2c9f8b26884ee4…

MALICIOUS

PDF

97.2 KB Created: 2021-08-14 21:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6d97ef100005b06a1dad7576320ef21 SHA-1: 00074a3c34ad360c65b5deb9b1fd4d73bc7151b2 SHA-256: 6c2c9f8b26884ee4d5fbffada586f0721075e3bb41cdf75462047a39c03b0acc
96 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 compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution pattern. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://lolakarimova.uz/ckfinder/userfiles/files/65772696235.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086045065758---94778386284.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/32098409946.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/45945820075.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/wawovelepajemosajeviwipun.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f9305e2f---risukuvikivivavizi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/90c321bb9d1369dbe0b94a23d6a1ea5e/42875012374.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7af41183---77960941314.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a7c161e9ffdba7b38b107172a95f3477/radidifowakasevusapek.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/dbebaa9c2534c8234d4625af80f09ffa/detojufagomutumav.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/61264418973.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e44927462b9ee5c4f7322a79fb6d93dd/41709560657.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e2a3ae966---zupedej.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/84848879316.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/42619850755.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/gexekuragesawumose.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4a17629772bd503492b56950a07e6d6a/vusisixowagi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/61454190189.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/gvog2frlklh216ugf0h7qjgk2m/niwifizumobubeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=finite+and+nonfinite+verbs+worksheets+for+grade+7+with+answersPDF 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_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 11000 bytes
SHA-256: a26f553bd33e6d5728b2830fbbd2f3ddaecc69683fcb6c2db127379926219176
font_01_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC0 16928 bytes
SHA-256: 87c90a701c19f07a450b675ee2278146fdf26c0d6d562a9d85828742cb724e3b