Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b28eba9b40013e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 15:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 37c285e522b2ba81ff81f08d7cb64446 SHA-1: bf52211a6988c40ccd5284d8c2603c3d2bf5dca1 SHA-256: b3b28eba9b40013e50e8aa173378e7c3dd5300563948853d33ee0674917d4121
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6968

Heuristics 5

  • 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
  • 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://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/pekugunewekopovom.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/dasex.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa517b40f---64429446810.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613439c2c844c---volonobubawesoxixojobef.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/5927831183.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/70504959657.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/pimol.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/981e13983bc6c7bef5350dd4cc397159/49164506719.pdfIn PDF document text
    • http://djapm.com/userfiles/file/46052960774.pdfIn PDF document text
    • http://hmed.vn/upload/files/muvomipoxukujinepan.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/xakenawosisifisonuxomoti.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/10825191114.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/25214504511.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/33315489741.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/dajogajadikamove.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jarovawajafiguz.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/41972228708.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1c897d4ae---12382572251.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613863f4d51fc---kegisotadawivin.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dekusaladawobofub.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/46749345708.pdfIn PDF document text
    • https://kristinanamaste.eu/files/basebejimuwegewefet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+piece+of+cake+2016+online+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 10956 bytes
SHA-256: eef37c1a516c14db92b5f05b3bccd2dc1049a886ea127563b40fb495bb4d5458

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