Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e862bce53bcbe6…

MALICIOUS

PDF

72.9 KB Created: 2021-04-28 01:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 48dbf76478f4f4b20f1785217c94b6d8 SHA-1: 9fc96c07db743ab65f288ca44950a3f9406aafbe SHA-256: 72e862bce53bcbe6424de0c75446e4cfae37f23cf74b7a0c7c79eea684dc40cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malware or engage in SEO poisoning. The document body, though heavily corrupted, contains references to 'Black desert xbox one guide' and authoring information, which may have been used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://amuseonline.com/absite/userfiles/file/zajokodefezomazum.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/321352c2dd74aa464c3bf2c5f393d8dc/69229576190.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/42cdee103295c660c3a33cc6d1ea820a/wunavipamukolamixum.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/m4jg66osofrrkdoeogh4hj1ns3/21589162586.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8161990d2---71373013595.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nbqj2c54c4un6rb3o3nq2j9qjs/limubefixaziriluve.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6612af43225a7422b0bc062a25392de4/83357648654.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a071ea0a---wezusapajebivadinafux.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608294d860f79---semobategogex.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777136a1e69---17886195779.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b1a6na6m4tvfacuh9ua9lcm19q/gubedife.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81c08e00---45007164433.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1a9afaf9ab9f59ecf0039c3e02eb0258/40768213720.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/j0b1bovla8p91seci7iekfs0tg/tilafaduvusinokezupupi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d3002f6aeb4fffdcff59f13ffc567431/63213058399.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/opr5cbda10nmcjb3bki4nsd49n/51368451499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=black+desert+xbox+one+guidePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 5428 bytes
SHA-256: 51f3099dc99f90ccdab12dbae3f0f4120a8165e9979b687960904d861c969eec
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 10180 bytes
SHA-256: d60b8f03d2c8a206c0bcec06d97b55973f0f8b1bfc31193ce16a913f42598871