Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba47447630c479d4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 10:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55b0dc9500bca11789499839faca4f96 SHA-1: c497f1df4d0b111f975c44758f26a307faa55c9e SHA-256: ba47447630c479d4ee50841114777b113424b537b9b3890636460fde4a0f5836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a lure for users to click on malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/dfb3e69b644bf9ba62a996d758bdaf55/mozetetefivebipug.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160987a2b53257---zuzuxadusabifixunekinade.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/86452156924.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2164a0ce0---sifavemekinun.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/finagapow.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/vagaruzidizojubajinejolip.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/85016023646.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6d6o67rbu4irlkmuv3f1s21p4n/nulimano.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/60604474749.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7fb5cf1ed1001034794ce6b002f77a39/21244638277.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a55173f2a96---70107947896.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ja5qqa146og1tsth7lrk0hcune/25301324217.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6ca20832---15830755672.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/f65fa82eedcb3ad31cf5d9a057ae591c/6737517966.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/78036373396.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/71270090571.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/26127055239.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9cf86fe64e6b03d394fcf8410155516c/kajitiranedisalozorotod.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/58019082364.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/rilubiwazokuxukozivuwor.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/gaxutexej.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/masedozabagoduzeporadu.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/50383141989.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zotusikadawobapijamoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=near+misses+in+the+workplacePDF 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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 10796 bytes
SHA-256: 7a2ae56877dc8b104872a5f47bd29e1bc4f8cf6833279df353831ca24a3d19da
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 16484 bytes
SHA-256: e6f301ef4061d51a191ea44fc79aa53a45bc69acb5d8c080e0cd9a407c509a17

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