Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1025ce648680810…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 01:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40322faab044e30c9f86d9478b81b73d SHA-1: 9e03d68621a0f39305c0811ddbff63ab795bafe4 SHA-256: f1025ce64868081004066e6aabda59502810993f88d89400ea598ee8ddcfa1f1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, with several heuristics indicating these links point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://rivieresoceanie.com/ckfinder/userfiles/files/80313047298.pdf In PDF document text
    • http://kompassztuki.pl/Image/files/zeluxepewufoliriwapukujaf.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/86677669612.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/kinabotanoli.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2962c5406cb37812b975f28436fc4f75/xotinitazi.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/xuzajometobekizuzifo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0eog61k9k8vgoqbqllp2hftdrg/37370253784.pdfIn PDF document text
    • https://eclearusa.com/images/file/kexopatijafaza.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/35646400514.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lowujukufuza.pdfIn PDF document text
    • https://servicepapik.ro/files/7314597117.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bukonuzon.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/1895648450.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6e4aeb7f---kefemu.pdfIn PDF document text
    • https://vientangluc.com/upload/files/6034520798.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c89379a7f---wisifuxepojelujik.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/kezaxixemapodukezirebo.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/zifexudokedivofolebenopo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/zetalijupevomemiwan.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/63613356217.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb519291c5---94137732331.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/tevidukatoxigenubopa.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210921_114656.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434f50769f6---pivabesirukej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sms+chat+heads+androidPDF 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_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 10664 bytes
SHA-256: b02ad79dd2884306c02b44223287947bfca3eb1151960d224f03a721b12a5e2e
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 16868 bytes
SHA-256: 53c88f890983dc19beb336ad081a4896f250568c0d7820f9ec81fcf4da4188fc
font_02_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1