Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81aeb2ff893976e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 12:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df7a61e2096d9c39a4c5631b56250904 SHA-1: 6ce5d3ab298427e5b94a7e5b0909cc688504752e SHA-256: f81aeb2ff893976e433b170aff9760b3bf31b036198931b791aef61441eeaab9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f1b5319618b233a7a64ba0e20ba5e9f9/goduxaze.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd64631138a---venubimuroxuweg.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/pewuwop.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b41aa3556a68ad84f0324f10d3847405/ridota.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/eacbc95a9efe1854242489fefb91a0fa/fiseno.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/xapuvagokipowiloginevew.pdfIn PDF document text
    • http://recviem.ru/img/upload/29376020627.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/madiruv.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/37689188652.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630341939.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e8e5c8df---48377148724.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wexijedawelorupiw.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/eb664b7a2850565c82075bd4aae96fb4/zomataxanemimonixijiw.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/34026581863.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vizojogaxu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a780fc4554b2605934515bf511f07d9f/57592938086.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb831f2649---58482136542.pdfIn PDF document text
    • http://freeski.hu/freeski/file/8205457413.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f6b8411181db6f8df1e847dd82eaa303/71873663722.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/91005157874.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/vovuxaletedoxivulilulomun.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/6784047525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+urban+planning+and+urban+design+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_off0000c374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 11000 bytes
SHA-256: 08eee72cf0886331d3b253af14926f97f9b841fb63f075db3f0dcbc2029125c7
font_02_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 16292 bytes
SHA-256: 76ad1a4c0c6b220417e5d4369b92f4177f6e0b87c11fc5f8081c248dbd4ad0d5

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