Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdafcb0e0d5b3e9c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 16:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e80d4fb4ba576d000ebc12feb18aee6 SHA-1: dfdac9e709bd5cae846a21552ce16191c87103b0 SHA-256: fdafcb0e0d5b3e9cfc2e03a7d5794d540f9fafc7e89717fb2b35974c0db9ff8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the 'link farm' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=ace+stream+engine+for+android+tv PDF link annotation
    • https://ph2020.org/FCKeditor/file/27494027154.pdfIn PDF document text
    • https://phm.vn/upload/files/revox.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/mofago.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/17032576455.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/kexujurofivasuz.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/bisoramezego.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/84094541232.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/gupogotakupavilugibapor.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0335b8f09---270927689.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/lodojatulafadago.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/99437968307.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/bajapumunenowat.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfd145112---dizuk.pdfIn PDF document text
    • https://rubfila.in/files/file/65736301230.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/xamugerururaxotijikuru.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/soxedonatiletatiwago.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/1477689906.pdfIn PDF document text
    • http://ipublicity.cz/data/file/sefir.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e41a800116e4c1e9dbaf8bc07f1de0f/55792451930.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/68037907225.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89680166316.pdfIn PDF document text
    • 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_off0000ac15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC15 15120 bytes
SHA-256: ec6c3893964d801ae4bd7c370ac46ae84c7b55863f2ed2d8e59269e641b9144b
font_01_sfnt_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10820 bytes
SHA-256: 17cbc3159e3664faf373db44cf032dff9a6ad26048b00f54f3ed6516ef757d5a