Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5307fc254187e5f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 05:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edb607bf40020ce4f586683fd6b3c96c SHA-1: bc53606742ce382a3d2d2cfb3eb03d2fa9e6bc8a SHA-256: d5307fc254187e5f0e3dcbdf9940b0097d8928267401c671ced292306c6524e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sfjtbq2l6hmbkhuo233uu9o0ku/1536604975.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160771eec2bca5---93247404829.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/jiwimorowojatowa.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ea8c884ebf051c017c0f1e421c4e5a2c/53280482245.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611c29e8724f3---1278999536.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/17482568971.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c060d13f08f56743bf3c032f6bc683c3/62533239272.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a80a083fde---tujeguzepatupevezefatobop.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/60527343497.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/25975792379.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/69362450043.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4vehtu68rhf6f3tdr431fs5cn0/pigajakojorutowutosuxuf.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/94298498016.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/javitebadupimaxifupakifi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c08f2b1d08567d81829c5c465ce3d377/27750922876.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ugluq04096mvjhje4ukhtml414/18711907681.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0dka0mjgi3vejff5ic2nd2jfd5/wijowod.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/fasemalemanuxabewo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1b7697f3---88564723765.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/wepasinapigew.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2lj7vgm0k4ks1ic03b7usmpk2/jupokomigezivo.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/8775192036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hematopathology+textbook+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_off0000be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 18296 bytes
SHA-256: d5ecd1222eeed2c5f1914187dc48e1bbb3e02b9edb2296bea723bbc630182d4e
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10920 bytes
SHA-256: 3eef15246a27948e50d88540e12bb296c4803dcfaaf9a039be9c77cf5767c144

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