Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e303da8659a59f4…

MALICIOUS

PDF

71.6 KB Created: 2021-08-09 19:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab93da0e46833389733757d41b31fa1b SHA-1: 656588108091665e7d54b702fdccc347f8a9024a SHA-256: 9e303da8659a59f4632124934da9d5e1195891eed59612d2d5d8ff80647403f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

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://archism.ru/uplcv?utm_term=toshiba+dp5022-sd+reset+voicemail+password
    • https://tramtron.vn/uploads/files/files/30367417641.pdf
    • http://www.pzkexie.com/up_files/file/mefiz.pdf
    • http://prvugkh.ru/uploads/files/vexebegadozojowipo.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/46dc367e0652dccf55018333fb8bc90d/suvunipubu.pdf
    • http://utuin.net/files/fckeditor/file/6261287478.pdf
    • http://montaze.org/democms/userfiles/file/saluparefejuwo.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30bf963c55---32461854412.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c656878207---viramagufejus.pdf
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/47440546716.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/zuderefara.pdf
    • https://nutricount.cz/UserFiles/File/59603851859.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ff21fc69cbba89d47e81e73189bd9ead/xatiludifumaj.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfccb9690---90217556150.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/62035741982.pdf
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/lumigazogobopitasul.pdf
    • http://citra.cl/userfiles/file/43745514049.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/590294884e2cea5b041b060a05500efe/kesalebakazij.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa041cd903f---vegozawuwejasipuzik.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082faa6be70c---56555935627.pdf
    • http://studiofelician.com/userfiles/files/6480166395.pdf
    • http://activesolutionelectric.com/images/file/36912814617.pdf
    • http://ranagro.com/files/gokegapadevukezoxopinero.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724879d2a93---vomexapudukogedekalate.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/javadipoletugo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b715.bin
5cf67c0d399989947c4d2c9963e766437f22f5be3c032ce0db44501fd394de5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 11340 bytes
font_01_sfnt_off0000d1bd.bin
0944fc3ff0c1e5108f6b1db18941161da86a957b6a872a450d860a7f1698181d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 15384 bytes
font_02_sfnt_off0000f917.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 16792 bytes