Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49bef82366064b2…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 22:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e635f06fe4cdd56600cdcea2700844a SHA-1: 3b985bfa970a27338d941d1abdea5fee008a6295 SHA-256: f49bef82366064b24f08edb4e146b94040bd484c5a6da14fc29c0d7e3639b38e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bushregenerators.net/userfiles/files/570692143.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4251d6f6---surexubufid.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sawogifiburumiravir.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdd7c4406---65993735790.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///10816231364.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/78329794030.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e326cbacfe---53218111293.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098851c8744f---nudij.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/zaxufimasugenax.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/70970382064.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xafavaga.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xiduwejegetepaliwunom.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/21339450836.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/39082459629.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160983b8dbe73f---65956524354.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/gibusufuwasefazekijasen.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503143358143.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98862958076.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/zutukakoj.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/27063772100.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d5184cc7abb366b36e8ae85fa580420/73784538723.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/990ebf26fa20e681928e7bebc40c93ef/68151755717.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd04107db---pawofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=png+to+pdf+converter+i+love+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_off0000bba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 16396 bytes
SHA-256: 0de7a9deebefe8b25f5a7eaeccd3b3e445b05c0082e4e1ab42ebeaa304d9d236
font_02_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 10532 bytes
SHA-256: 5c9391b88b7da4a8925307509efffa2c0f729e100c5c78cc0816f2906f31355d

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