Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4bc44bd2bc7b7b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 05:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2318977fb26f7810e117f9eda0336782 SHA-1: ecdaff321358ce448573e3aa74197427c1e981e8 SHA-256: bf4bc44bd2bc7b7bbee45ce5af674b621fdb1dc3b0872d3bb8d2bffd46b24c90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=online+converter+word+doc+to+pdf PDF link annotation
    • http://computerdoki.hu/user/file/wibifozajilosop.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b355ab83f9---robibikigipisib.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jazevixosafilelotuzi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c2d3440d---94872852364.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/93222876157.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/44178226885.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xoralirexe.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d4312edcdb8e8539431d274fdc2bb674/82960140110.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/74813012890.pdfIn PDF document text
    • http://cissi.it/userfiles/files/xomivetonorolonimotud.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/pipanodikovotefovora.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///vawugifafazaxef.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/56385344175.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210722_B4D34F7CC1CE2FC8.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/edc79a53c3c9a86bbdcabc23bb09d8e7/79040210830.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/74328940207.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/zusofuperedog.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a1241994a76---5210848887.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/70885844582.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/jakaxudale.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124fdbcdcb6a---dufegasemuxisus.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a0eef8f667e5377ff71f9f836a65e431/41098765600.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/11493458741.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05381f0f51---88278286981.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73c593706a---10770448288.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_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 16460 bytes
SHA-256: 4474c4ff7aa86c5eb5445fa2c694754dadf09514a4906fe50728f184f9039bac
font_02_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 10460 bytes
SHA-256: e5718632700457352feb2ce0ec22dfe7abdad6afa5f82a715c6ba56a5e3d4d4e

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