Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c4eafb699f09ef…

MALICIOUS

PDF

85.2 KB Created: 2021-09-24 02:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acce65fe4f11b50866ca8e26e07cf4db SHA-1: d754e97e8505e19c6f6be9d5471dfd8ceee3cfaa SHA-256: 19c4eafb699f09ef7a208c0ba8f4e22d15b390137a44c0b21f6c0daaf1cae20f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites, suggest the document is designed to redirect users to phishing or malware distribution sites. The presence of JavaScript points to an attempt to exploit browser vulnerabilities or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=reset+app+data+android PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2mcm05foq134l8ii82fatbm755/89639773546.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/4199746756.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/86042260392.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/3255925968.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/22590630422.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/81280321641.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kofexoregovipegiwogiguzo.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/50270078817.pdfIn PDF document text
    • http://indel.sk/userfiles/file/82541811081.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614615872d5fb---diwuvegukas.pdfIn PDF document text
    • http://szwygs.com/upload/76761060841.pdfIn PDF document text
    • http://mp-journal.com/media/file/22677169736.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sl9n1mtmtklcfaoubr9dt76hoo/bakewor.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zojezavunidoranef.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/96867131956.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/30399583059.pdfIn PDF document text
    • http://esejsc.com/upload/files/lojetodikojomeru.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/60472272699.pdfIn PDF document text
    • http://tulga.ru/editor/files/82206188260.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/86628438748.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/waligawonuvotuxirusemav.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/23173743323.pdfIn PDF document text
    • https://purefeeling8.com/data/file/xorijilefudufililumu.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 18420 bytes
SHA-256: 97e6640157862516e0dc4dfb39e0341b497f89e8c53173bb99d95e1e3e00785a
font_01_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 10384 bytes
SHA-256: a6efaaa98b823ffabf0cf1435abdafec9e6d182480dc6a1df3f3ad201c9eb527

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