Malicious PDF — malware analysis report

Static analysis result for SHA-256 0900c32656f3b941…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 05:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1428cac335cdf81d96a6cded66fe115 SHA-1: dd8a75e86ac1a1069bf25da535a85150775dc8b2 SHA-256: 0900c32656f3b9411e2b1a9bc139d21579abd9eb76741da5fac9e4f61c084fa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators points to an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bio86.fr/userfiles/fichiers/mibevidagamu.pdf In PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/37005069632.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/filukas.pdfIn PDF document text
    • https://gameclub.by/uploads/files/xemila.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/61128720736.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/mabeba.pdfIn PDF document text
    • http://sro52.ru/uploads/files/13001832773.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/35411677241.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/bumokoxiripixozo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1ee59157---17837475369.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/guzitipebeno.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/wadorogijegodi.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/30038721886.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/filivuvekejakolatenewa.pdfIn PDF document text
    • http://envigest.cz/upload/file/81695279891.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bl12l82hs0m5qiibu8l55tonr6/nonelimegizaj.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wisimiwotenupix.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/burabiramatusosuxobobug.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/55433676654.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161331713d7e2f---45832642241.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///38736769930.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/55138129020.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/sumozarikafakavu.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/28586743649.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/nudanunoganero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+kies+software+for+androidPDF 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_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 11004 bytes
SHA-256: 6bcdacec304f8448ea173871b42f961630c83cb0c80db7703f2160b069698dea
font_01_sfnt_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 16140 bytes
SHA-256: 5ce1dbebc19fe4063d66be339e17be14a6f8ea9dd795893037126d3a57c25b91
font_02_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1