Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c10ca516f136b5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 21:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d77a17e3d77fa49597c6bfaf65cc178a SHA-1: 6140dab486382c0e5e51c23a60be76982f981b89 SHA-256: 93c10ca516f136b50ea4fbe9c9180397aa59e42546d173d060b1673bd13608dd
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a malicious document used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://slesnick.net/userfiles/files/fifunuvifusuwanukikipide.pdf In PDF document text
    • https://asfus.net/virgsurv/userfiles/file/37813905259.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608179990aaed---seselejexejisiwevowul.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/58c60a59c8079aa6994d20a5e11286ce/67897847443.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/jemetowibopu.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/74106027838.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/63056342684.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/lexegawiporinasej.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/16021008650.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/7173654785.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/86856730862.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/klotarhjakrqu3dufq00qiu8el/963832259.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/19624792455.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1e66ee08---2021634365.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/27840773388.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/040ti9919usq9ei9utugge79g9/xunozotesanosoluruxogat.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/32191220891.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210530101320.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j7ik3mjgg4d9fvl8uopq653t61/dapet.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff94beaa0---58796334385.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xezesagipokowelisoraneka.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/78890028478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=subject+and+object+complement+exercises+with+answers+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_off0000b86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86F 11516 bytes
SHA-256: c7ab1c0ac4e8499a6a9c70962655a49e8c84484406a2c43a214c8cbe65ad0b11
font_01_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 16528 bytes
SHA-256: bbca465c3a18ef27fb1d4985f69113bbc9f47d116d35801c48bcb2bcc0457a5f
font_02_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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