Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d6afdeb3a47976…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 02:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46fbbe3197ee1840e0767b4d8fbcc7b6 SHA-1: ca2428d6efc438c178453a4303dcb70ede2c6814 SHA-256: a8d6afdeb3a47976635a2e5b5515d158083156c9ed039ae5276f1fd5d7eb4634
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to potentially compromised or disposable hosting sites. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://gitimohammadilakhimpur.org/ckfinder/userfiles/files/zesevu.pdf In PDF document text
    • http://gzxmbx.com/uploadfile/file/2021092004220873499.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1440a633ccce306bc73b1e200e17c9c9/rofimijorarifawipedebu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_8066B2F837ACFF47.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/tabosarek.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/kizogurunupifojuzisalige.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/84302007437.pdfIn PDF document text
    • http://liily.jp/upload/file/20210918025238.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/dotexumoraziserowurosupe.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/faxoba.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/44325265446.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/buwexugaxofuxijoma.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/58054181422.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/63387246673.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a182e971c---6353590972.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/lufalazojejubenefusamebi.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/69100250837.pdfIn PDF document text
    • http://netart.hu/userfiles/file/dasolazozifedisujo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/60cfncl482bj8e8sotk7a7ukl7/limevevadoloraxikikaba.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/10652204701.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/23963849785.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/powaroxowog.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/68550434865.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/kinade.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/52764580541.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c592acec54---mivusezujagidanagiger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=irctc+rail+connect+downloadPDF 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_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 15392 bytes
SHA-256: 35d95d71b6a119d5709ab9f95e47226b2da1ab24a9cd1da1c8def9662bdb60fd
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10232 bytes
SHA-256: 1d24efea9eaa019949803cf2b59530d1d5795c33c60598d88a443ada2988511f