Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc39bc92405f50e…

MALICIOUS

PDF

85.9 KB Created: 2021-07-19 11:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ae94f3f124e4feb191c08320a0b9f14 SHA-1: 4e1de1fcbe2b4439b03c7414d4141b1062059c37 SHA-256: bcc39bc92405f50efc1b0d45762574ec29d0e596f9bd29e2bb388d9b237af942
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to potentially malicious external sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://bhttourist.com/upload/fckimagesfile/nonedudefivotoluwofexes.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4b54aba6---disozibozinisoxewo.pdfIn PDF document text
    • http://yuha.be/_files/file/fetamopojadilumobova.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4e8aa47ebe22e2664ecd0ab9d13ac5b5/39266984095.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c812f5a73d---vuguvebikixuwalanewinize.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c894b85811e---fagotelujopubajus.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/wolimebuna.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286ecee257---84620268861.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d224858bcc7---71933292673.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/57845827059.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/mabipolukufevexeri.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fa8223416---5476158421.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/salinixomelowimufelob.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xorazi.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/zojis.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9517ea37aa7bfdf318b06fc0ddc033b3/mutalonixarilofagis.pdfIn PDF document text
    • http://martonelektro.hu/files/file/40709248245.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/22241641083.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/60394308630.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210608101349.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16099861733445---kapilidisopepapala.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/871357f4dabe4dbc04af36b97fea92a0/xawilapazigukotuwilaw.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9b878cb55aada66183c7b7eb564a7cdf/55579446855.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/pilizexesa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a224adc6ea0---kebomudasalovoxigu.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c05574fac6185d3def8516de8b921e22/96565342468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=guildhall+art+galleryPDF 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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 10388 bytes
SHA-256: cfa227d21d4e2b8bb72e32984dff741cf4aa325822de78fbf2aadb27f9a4dc03
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 17948 bytes
SHA-256: 1412f0eeef4465e5d15fa73141475e15bc0b93ca428be0b7340741d61e3372da
font_02_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1