Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df25b6da33a8b06…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 23:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d48b9f13362564a20c725bebe4d96ee SHA-1: 4cc20b3be3e0de60c8f0a748c7b2694b928fcf3c SHA-256: 9df25b6da33a8b068db2a2f26313bc365d830b54304a7b38c6eed524c3ed68a7
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. The document functions as a link farm, directing users to numerous websites hosted on potentially compromised CMS uploads, indicating an attempt to distribute phishing content or further malware. The presence of multiple external URIs and the structure of the PDF strongly suggest a malicious intent to redirect users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc847b524af---86897488759.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/67cmh2m51kkn1sm9loak0peaq4/74455378068.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/927be6fbc90d6f8c1be060ba6009e797/jorafalesudefetix.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/69b66cf36cc128ecdb61645435374394/girejirevuvib.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608082efecdcf---jumesubu.pdfIn PDF document text
    • https://maymac.info/userfiles/file/tipajobenidipu.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///78072295610.pdfIn PDF document text
    • https://songhongresort.com/img/files/latagij.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/97507028826.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/jefirepuzelegafami.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0e3f56821e4910471c444984eb83ba0a/9658657512.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017c7def5d---gobufusirafanupog.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161261c3440c9f---zusevoke.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607242132b9f2---27031140467.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c3cbf206---20199775358.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/tavilovigurosutibola.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/nekejav.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096a12aeedec---vaxomawewopumoxuje.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/8587772066.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zovubuzopazawuvinise.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075eafadb84a---18520684134.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5b0e2b9434affb80472cf5cfb3afd770/46734475317.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/vudafobirufoniwokefun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=complete+the+following+sentences+with+there+is+or+there+arePDF 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_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 15808 bytes
SHA-256: 9b43de2d1a67e2aff9e580ca3983ca4e5291d33f64b4d4b0955075c6e27a5419
font_02_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 11044 bytes
SHA-256: 9d5c60e7640d770cbadfbfa7da8dbf5ee90a474ab1244ee6c710f37e02d0e769

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