Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76a16d548afa5e8…

MALICIOUS

PDF

69.5 KB Created: 2021-06-05 13:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dcbd6cc3f90d198a73211ea3b5742cf8 SHA-1: cae231d80d9cda3a6d5a8e501f3a76186a6334f5 SHA-256: d76a16d548afa5e8dcc6e03721df994f06ac2a830a54782c3db89316ecd61cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=how+to+charge+everstart+1200+peak+amp+jump+starter PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da3e83c0e---jonozuzifupamel.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/860c9c24929e70dd00b66f0d13042df5/jikoruzi.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105181608491534.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/gepajitimurekevezaxi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/60f3bd971e58038889be5b6165ccb6e5/88750121552.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18189e44a3---lekemakopefeline.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a9475ecb312d956e1069280962672549/82482603037.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/dilajogurupamubulof.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/72635277969.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087f67a16e7a---nigilugegeme.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c7819dc4---timem.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/wupeworinetofelozix.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fdc962fc---kiriwotasijekurajenuxum.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5625bcfa---juvinetijazir.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57b224552---gurojunulomex.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ac80dcc054d2e696f4a8dd7f896c6258/xuwodufugesexuvemisag.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c13525bc---givekolatenefegal.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7sa0kbdone8ij6gfikt13abj15/62830116735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 5892 bytes
SHA-256: 267a467675fee6c005a637658e430250a7b056ee45cd4f9c39cd2573b17c78ed
font_01_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10448 bytes
SHA-256: 175ec37d0385f5ab50b3bd5b6268d21d8462fa13deadc79e2e63606b69cb0696

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