Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdb903558168d65…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 03:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0dd48987056be4ec08886401b9f211d9 SHA-1: 2dd39bb1818a63604e5c95dae83d4970ced92c07 SHA-256: bfdb903558168d65f24d9fc5d5c931fff8fddf49874ecb2ad45fe6e3f5ad849b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://zpkprzemysl.pl/ckfinder/userfiles/files/gavafixupe.pdf In PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76376325965.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/71620795957.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/81971a32d1bfe41ce24d103ffcdafbd3/45563141222.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/13264311194.pdfIn PDF document text
    • https://abeess.com/userfiles/file/99167776310.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/nolosi.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/92691925689.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/89911927435.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/kuwabidida.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/vff8kd4qrbgf2fftrqrgur6h48/fojunuzira.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7e20469af510eb62dd9f4479ddb56b66/16175225947.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/8488803283.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/nodogirowizarizak.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160af763d19d35---51819414458.pdfIn PDF document text
    • http://sivam.pl/files/file/sojipo.pdfIn PDF document text
    • http://fruitsad.pl/images/file/17219188325.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/47849585454.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/buzadovifexepodek.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/55586630729.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161111a3081ee0---46932249821.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85b9c0f10---63929764156.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/zezelazovavusi.pdfIn PDF document text
    • http://tfforming.ru/d/files/80917366364.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce651323a3---49361661870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=legend+trumpet+solo+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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 18808 bytes
SHA-256: d24110e3fbd457eb6aa944352551155977cb6d98dc4feeca2f73e2a5f89edaf0
font_01_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EF 10644 bytes
SHA-256: cad07c37206e511864f03d077ee8cd62227cdb2bb6446758b113ab9e0e2a03e4

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