Malicious PDF — malware analysis report

Static analysis result for SHA-256 24084fef71a8e3ab…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 02:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 010113c05f4af414050ceb8b733d0f62 SHA-1: 4e9ae7964d0af3afe533f1198c1386688bc90a82 SHA-256: 24084fef71a8e3ab3ecd5142766eb4b8213f5d006a73ec63385d2e3c61fee1ee
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple external links and the compromised hosting suggest an attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=a+soul%27s+journey+pdf PDF link annotation
    • https://vcvscr.cz/www/www/fckphotos/file/81861359638.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50441210844.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sovadoxinazoxokejemo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdfc429eb---kelegabilabaxasofi.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/77170884983.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/94012898332.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/71553711665.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/katevowu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/50526599422.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/aaah3v7a3kd45325lsue6thbbp/mibabuwijulatum.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xovoxilujexumamujazesi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0hcm7v87bifd6naisf0a3dhvt6/kegetatidis.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05f5646bb---18654429517.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a414c1c69---sejawukixutosimibajige.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/traiotu5hf4j4pr37f9h3njp7q/sonoxeluxuregew.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/37051876980.pdfIn PDF document text
    • http://agro-partner.com/Image/files/nevisagi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614464b491785---lazuvapamig.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/nonoman.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/50449768161.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/bifinolojuguvokibawizipan.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/ludeboza.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/kenejubaxojewijenosusan.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_off0000b548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 14704 bytes
SHA-256: e56641baeef539737bf22ebbaa5a79021c1b68fcc59b67ae45aa6fbc59eea24a
font_02_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10500 bytes
SHA-256: ec167a76829c2166251a07304791f4cd51fbf54ba9a00615e1fa06291d2b5603

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