Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6516e2ce4c84680…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 06:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 486af0b2ce0fd9ffa074fc38abb8b573 SHA-1: e2e3f8dbf500a8b4db1efe8931daa2715f457495 SHA-256: c6516e2ce4c8468018b967365f5b98f09f6cef0efcee0d41f2df27a56688f16c
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 upload directories or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis point to a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nscs.org/wp-content/plugins/super-forms/uploads/php/files/56b95efa8309b1358b17ace1139ec00c/vujukapenesapo.pdf In PDF document text
    • https://vsetinrally.cz/userfiles/file/fekuvaneberuduwagam.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b2d1df2d---9462456579.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb3625d32---105960682.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161078c9f30e82---59585000401.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/47196301030.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/71338782818.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160afa541d1420---birefuridowonefa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160790b5cbffc7---91153832400.pdfIn PDF document text
    • http://someteme.com/archivos/_20210721105921.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/nitijofizakow.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/dudubojixotubadewu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121c4d62b0d5---jofatubidenosejelobud.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb92b48fd6---lopebaliworewawula.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/zixisekobixatudojus.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/gokot.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d1894f2a1---gulup.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4a2ec622fbb0e96f7b26524b7ea5e041/winepewosoligixuzimu.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/latifoza.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af86a76bbc4---popexojesawutelo.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/20106794021.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/85158011777.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deed68d2677---36568011243.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/5ceaaq1o05jg4ih5e7lhh242fh/gorupewisuzetudupuvexo.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/wevigog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=head+first+design+patterns+1st+edition+pdfPDF 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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 17400 bytes
SHA-256: 6899de8599fbf954ea435ae0fbd725d311741881e13c07e09c9f53f16f8d09ac
font_02_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 10672 bytes
SHA-256: f64c7470c787bccab28fb2a2f15b979f915a52230f976013ca71cf6a41e4da00

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