Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d9a9f89c2e0c3b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 00:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a24fd3b5fa73d150ae41382f9d20637 SHA-1: 8144095a2d0555880fd7f6115ef4ff1e03519152 SHA-256: 11d9a9f89c2e0c3b6f45dc6852a23dcf98efadb6b2511d698ee259afcaad6a8b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs, while numerous, do not provide a clear second-stage payload, but their nature as link farms is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://abakus-routing.co.uk/ckfinder/userfiles/files/10937281221.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/84911326109.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd2719e37---bilavu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/p2rq17qk9j8efinotbnc15jnkr/xeburajanonunuladutaka.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7ed66bf14306e664ccf953865f6d7523/xugilenubimi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6f35ebb2dc36b6506c705fa6c41caeed/27396684779.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8895e9bb3d544645fbc91f4f8ccd4829/93564360642.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac3ea4ccf---21643528416.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/1770735278.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/48549946342.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fcfe2cad5---2525672996.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/26992233185.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/86901980581.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/67239817266.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/97basnkuk00lfemf0atk06b2gv/rigojijugagiwelozoj.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/javagemokitikefovo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/365273bbab25bfd8252ad4ecbe8515b2/37494437526.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/91579338967.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q1h0408vu2oukg7jc5g7j1m4cd/22384827305.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210809_CA00E73402A3CF53.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/7318236aeec6ddf872030830936a8db6/lagerawades.pdfIn PDF document text
    • http://suecoop.com/UserFiles/file/forasezuxosakifodowoxuk.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///73237388854.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608327878169b---fisutaleruwumawutasar.pdfIn PDF document text
    • http://slsnn.ru/content/file/34965113543.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c39c79b9e60e5729ce034efcbfabaca3/riduxaxeforoxigoxiberix.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160749164c3e25---11059172701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=praise+to+the+lord+the+almighty+joachim+neanderPDF 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 11060 bytes
SHA-256: 96fb41231375e85435584514942ba7af8ac4a42c88b624b149ad70e919876929
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 17204 bytes
SHA-256: 0cec6d59e80f8fe587bdffe011f62f67aeb600638650b2961c29b029e49af115
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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