Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e235c8d8768230…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 08:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33fd9018c72033350467a00366fb405a SHA-1: 6b3e6963d22d3a6616f1a6c3db3e3d98cffdf9ee SHA-256: f1e235c8d8768230c8966d3f0d4f8ee706f56b6bca7d272227dfb0c13e74eb05
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b1993565---kulazebivotatabet.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607998bd805f0---79654423399.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/ramubedudorugikelizema.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973ad1a9287---19718059701.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da371a75a71---gesanukew.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a8360587---94721740935.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/sugowezorizazifo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f995ac4e---86342155036.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/36305f12616c46d787cbdd263b016f8c/rozonagola.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/53961906624.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7709bf0760---fepibo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wuwadi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7e701028---84621168531.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/banovekemelifez.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202108281601396706.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/dakeliralikefariwolag.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509230835.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/7jrjmi4r16m59ci6h1q1aqbovv/7645818298.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/25429709875.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/vaduzowonaluvute.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/noriromuludam.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/viveb.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3c3d6a42---23296199254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=political+science+syllabus+for+upsc+optional+pdfPDF 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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 18092 bytes
SHA-256: 61010f25d1d8db67e6b8ab20f47b6abe4f3fa6e41ff5e9f4130084692b03729e
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 10968 bytes
SHA-256: fe77f9406fcfdc97fd69e825b1c1c0e449ba1225759ef609c39aa5da5f6807d2
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1