Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b79efd38716fed…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 10:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d6aa9b5229da9148fe4ae31e0b3b7ff SHA-1: 1e556915ac73a4b37f8eed77724a7f36683f2ad6 SHA-256: 23b79efd38716fed82c8e1f141fa34fdeea9486ca8fec9fc53f5a8a1d4525f3f
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to potentially malicious content suggests an attempt to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://kawanmto.info/contents//files/latutugavupaxofeduzava.pdf In PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/kugejodugipal.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf69a2e66---23515437321.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8ej3enki8agfnqoqkiv664ehp3/pejuzog.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb12a26974---sepajujufisufofodenevege.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/28766696473.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30bd382d3---52876417623.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4c52f69b4db6462bcb0d68d1ab6835aa/xomap.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e166df26b---juvojivonu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/jijudepesulutiwetaxet.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/xibife.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/60369984188.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160767bc5351b1---48400469076.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/11d09bb9af0bfd5101d008d1f8305666/55252489190.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd8c88c62---pedaze.pdfIn PDF document text
    • https://lecapsuledigian.it/file/xanufo.pdfIn PDF document text
    • http://didopack.com/files/83544413637.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41262448228.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2bb6deb71de33c4190227eed9d166243/30178636035.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/dodebibeje.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/70910116960.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cf6dad327f32f9c9059d56c853be53da/12238620125.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c37ecdf136f74a5bf27666e6f95c39e9/45356792652.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/55jmap1khnqk079nnokn1rji3n/minanivemidikuri.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74346423582.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/bc1444920f606e41c187590efc3aa959/sadox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=section+7.2+eukaryotic+cell+structure+answer+keyPDF 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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10928 bytes
SHA-256: 1853e2d9d43b802052f7547737dcab4ff1121ed6435cc3cb06e26ee2ff4e1785
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16936 bytes
SHA-256: eb7e7d115979f87a9b9b31828293e3322b5f7b31fca7ba5397298b1afe81b426