Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf2b234b2bbf19…

MALICIOUS

PDF

74.7 KB Created: 2021-10-16 11:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e83cacf61f88a71531615cd2631774b9 SHA-1: 06b4ab3890bfe1de57b6ea284a2f7b9c8d6c52c3 SHA-256: 4ebf2b234b2bbf190e3e898ca2dfeb95eec03449cb9567774d40ace3bd7c1c0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and being a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=rotational+speed+to+linear+speed+calculator' and links pointing to compromised WordPress uploads, suggest the document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=rotational+speed+to+linear+speed+calculator PDF link annotation
    • http://imobiliariaimperio.com/files/files/29641571917.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/70204515645.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/29038819738.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ldta3nv6mn96br4d4mrdq4l07/85835788257.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/zavubilipitijugefajuxo.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/joganojepifitapatuluweke.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161416a45d1422---kidobovoxeriwunofivi.pdfIn PDF document text
    • https://dulichduyendangvietnam.com/uploads/news_file/birodemawusamalona.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gatagekan.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vufezonejoverinozusuginu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbfcc5532---savarapiselofukefi.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/84128280708.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9af7f39fb4c4a2c538244c9008be8e53/danakuxubenagiwelibojuve.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20211003043552.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/bomawunapujolupusulazur.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/zigazikiwarapojanux.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/54837663621.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/mesotogoxuludinixosomigun.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397fd2a0ad8---puparenitomewebapiniji.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/71440068254.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/tawimawuvegomufomojob.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60853447073.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109151233117065.pdfIn PDF document text
    • https://trainova.com/userfiles/file/vazud.pdfIn PDF document text
    • 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_off0000bd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 10652 bytes
SHA-256: f2e2bc99bdddb03d10547e93715d10b4a4a7f3d2c63673913774758b1c21c920
font_02_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 17936 bytes
SHA-256: 8efded2c59a03c47fd59514a391fa54b076b8d7e0e71eb1d196e513858981174

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