Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fdb2c4a4f9f3d5…

MALICIOUS

PDF

88.4 KB Created: 2021-09-09 17:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b87c6459dfc0c4afeefaf2397622acc SHA-1: ca438355fa0162b0f957fa71ec7d3b075a7bb6c1 SHA-256: 17fdb2c4a4f9f3d5f1ead68a60fd935728c435ee61addb20f81f5b3ff9316052
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and a link farm indicates a primary function of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://lrsinc.co/userfiles/file/31435758332.pdf In PDF document text
    • http://lubrifianti-auto.ro/files/file/57210952857.pdfIn PDF document text
    • http://adveotec.com/img/file/kejenatexisuga.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/bifuvalada.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7aa7a99d8d8e897304da99392fcffc4a/55345340597.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c21996f---63310884857.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/pukedoxegikefakup.pdfIn PDF document text
    • https://matratva.in/userfiles/file/tabakumurenulaso.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/22762515622.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132009c27dc4---30650952980.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/27962541513.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/44dp77igrg27a4imjvgd6v5157/99235470609.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/rubaguxawirelade.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wiliwipiwakupaxube.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210905014908.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/15111342213.pdfIn PDF document text
    • https://digireg.org/upload/firam.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/77597835817.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/15714915834.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/73711353687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dragon+ball+super+season+10PDF 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_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 17992 bytes
SHA-256: ba0d3463f503c784eefaf779b7a5441825266ba9a885db5defef24ab8b557e51
font_01_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 10652 bytes
SHA-256: 6af17eaad3013bc8ce369851317851157873aac8afbcb4ed5eae11f58894778b