Malicious PDF — malware analysis report

Static analysis result for SHA-256 a298e66f43528079…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 22:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d2279557875392a7fd7dd583e3853e0 SHA-1: 8824786a03d56b1c5c68bfc3271574a64eb9302a SHA-256: a298e66f4352807998451d77301ae7e4e82a048cd9267e043dd3c89618d8b039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms hosted on potentially compromised or disposable infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a significant number of links designed to manipulate search engine results or direct users to malicious content. The presence of external URIs and the overall structure suggest the document's primary purpose is to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=docker+hub+download+image+manually PDF link annotation
    • http://genbreedpublisher.com/files/upfiles/file/wifotidixafegepu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b2f52111417967bf7467c55606aba2a3/fajodagul.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/siwokevararexuwapite.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-14/20210714130000416920.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///19553448738.pdfIn PDF document text
    • http://gestioniarmatoriali.it/84764739350.pdfIn PDF document text
    • http://huefpdf.org/upload/file/95455545086.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/78525154472.pdfIn PDF document text
    • https://triosms.com/userfiles/file/lidexanosu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///26058997777.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/baxawavekazif.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/ladorufubofedonulomujexab.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/pobanutubasubeb.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609db26a37463---dajunabenowukujawijef.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbb4171e06---zewoxumepa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4222e536a3.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6089291b0---libofezimutafep.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6c60218db16375e0cba7e21b7caa4942/mebexakuwitametopupiwogol.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/18a05c32cfe8ca9c0eccd7e30009b574/90940406695.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/zoxivut.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/13751956192.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/99725243121.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbaa550ea---7160561602.pdfIn PDF document text
    • https://senhewood.com/d/files/jawufona.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 11084 bytes
SHA-256: 53601b299395e8db6e4e483a8892d08c3737a198e20b8a3f2ae60fddfaf50193
font_01_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 19816 bytes
SHA-256: 5b1666600523c474e355309e72c705f065f975cccd37532ef6c15efc2015530c

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