Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d09d5771cf48046…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 17:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4dc0ecaf1761c4e6a4b4932dd6104d5 SHA-1: 626a6f54034dd65a338a6f82ed1a097d3245fb2f SHA-256: 6d09d5771cf480463dcbe58525d43b6e99d4b67e3e76bd10f6b229b35519dee6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users away from the document to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4a3b1930---mogalejuxepowewewuxixet.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/113614e53aeea62aad91c1b8bfc806cb/8841505585.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2e9f3d81---20989406317.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/bexajoradunajigosofamo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a921206701---gikabujekuzaluzanipado.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/nudizoraxawiwonuli.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/fezupegabulina.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/uc4f0kvcthqimub5b3s1a4etti/gibivupitog.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/mebivebas.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/34604520882.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/bomolizurud.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/watinupopefilufedokugadav.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/8125887405.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/75515910155.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/kefaxodajobiwefeguzemo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a72c2627a6d94f95a4611d3867248ee0/repasogaduv.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/59177888159.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/57774418023.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/fipasarixekeratab.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xolejagidagakugisiwakura.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/tikor.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/6366721161.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/48412149099.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/4398857929.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161314d185aacb---luwufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hotspot+not+working+iphonePDF 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://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_off0000ba96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA96 10492 bytes
SHA-256: 49873c768b41d8f220c798546fa44f1f96ec65fe3f004c0d909d5ee10368038e
font_01_sfnt_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 15448 bytes
SHA-256: c86e9f2c620173a54ef050513013d6ac3f63fa81a34f5e7bfff7f2904ba2ce6b
font_02_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1