Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0cec1285ba4a64…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 03:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf24b5ad2fddd13cfcf444ffe101fef5 SHA-1: ff4876546ce9073489e28a118ffef7a8633ca8f2 SHA-256: 8c0cec1285ba4a64ccde5ae20db1b348abf00f9a69ba7fef7f63da41f329f586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://datxeninhbinh.com/data/dulieu/files/23190276586.pdf In PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jumukakozewugasoxuzowab.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/23028061306.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/mokurixalaxanip.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/75913597570.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210912000302.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394c7ba4cd3---55604051511.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/95614669275.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/kogagumexa.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gupisafuvulerag.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/55876999574.pdfIn PDF document text
    • http://eksternest.be/images/file/91084809079.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/90707708773.pdfIn PDF document text
    • http://paliukenas.lt/i/File/64612141809.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/69179553430.pdfIn PDF document text
    • https://campermagazine.tv/public/file/75424875268.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/vaponawizoxuko.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rb34879aqv7im6i62nh3j8krl5/69010844093.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/kamapoxanef.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/8257394540.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/9958319674.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/pebax.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/kiwixoropikutot.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/43218350826.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5b236ec0675216dab9fa5fccaa9ec607/dadelesakuxisuregasal.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/baziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+restore+files+after+factory+reset+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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 16476 bytes
SHA-256: cc33e7ab5a0c52d8e5facae70f99c763aefa5916372ad52f7da9f04fa6bdc4c8
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 10660 bytes
SHA-256: fb936879452df05c1bb8c7256aa71c8ae304b5a7ea9161b04c1040c9bb0b1092
font_02_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1