Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf6395ccca3c1ce…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1ed8f47de757b5cd68f5178dec4af2b8 SHA-1: 70ca5dcdb11e501366010f89708d93a0fa78598a SHA-256: 5bf6395ccca3c1ce96c8564e5bee5e924b73a0f6ae19a8e5b3f755dc3dcd5d83
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern appears to be luring users through a malicious attachment to compromised websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://wastran.ru/uplcv?utm_term=metropolitan+property+and+casualty+insurance+company+phone+number PDF link annotation
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087784a3a921---fiwikevegitorodofulax.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e159c5a3eb5---73111038838.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pusavitagox.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210613155327.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/6a92121851f1fb02e6b4b62aba3687d6/28591871759.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fezir.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/dunimozurowululupuzozo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd910c14bc7---pokunironiwusawijeg.pdfIn PDF document text
    • https://zzwgjx.com/d/files/42785654856.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/wunobotodalokoxebep.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/87556396115.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d62d71ef8b1---81346104506.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/222e5492d757f3880755d13501559184/59510864512.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1f79546c---57602105553.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3621618c730a371e2aae8f51140c3860/94723942117.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tirevefavavu.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/tofagunimuxulag.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082795802ed7---74896838350.pdfIn PDF document text
    • http://didula.ru/img/file/majota.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/peworipi.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/70676313192.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zegodobasuxifasovagolaka.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/148aos867schae8lg4l5egrnjb/40997352510.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ijbe0dp1onre3q9ro86aalhev3/34580898232.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/80193149358.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_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 11128 bytes
SHA-256: d066258a3417f7c78390e69604f79fb38d30486c4371255d70d0496e30410e04
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 17320 bytes
SHA-256: 536b86e6936843587fc6ffb3bb2d73206e85611937d27191010433d565cb7e4a

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