Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab24363f138046d…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 22:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e329994c46925a4a794bb201dfa16d4a SHA-1: b743a3ba7ce2be37f4c1af53df750c561518475e SHA-256: 7ab24363f138046d97f589956dac8105ef84b6fa1a09159ad1ab3e211566bc0a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The structure suggests a multi-stage redirection designed to obscure the ultimate malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c153a51fada---86402138450.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925984d0e3c---16204326913.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210626185854.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9h0mto0i45sf00rbsa62gi35n0/40644255603.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475d87c12a---85703899791.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/sulodumetekemi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rg34k59311btuto42r49d2dhr7/bevodapesamaromakipam.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/likujijowogujoguxusiguxij.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/79588014822.pdfIn PDF document text
    • http://becucci.it/userfiles/files/vukifededi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca51bd02c---dulejixojevawisamawogu.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/18663389160.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609af2ca51c11---sububit.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/58460158339.pdfIn PDF document text
    • https://tonitomov.com/picture/file/74848866046.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785ea3c9b9b---70495066012.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59a736bab---87630238213.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/339b320c83971acd2108bd2475dce8d2/37120525026.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hbca7fcvpggbus74nuoddg2qff/64556105009.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/xikuzemevijutikumojeni.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/34261066448.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/14099946573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=average+driving+miles+per+yearPDF 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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 17260 bytes
SHA-256: 59768ee8f5f385b459055711a64f5b95eb3b1ca33be6577656d62fab334afa70
font_01_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 10680 bytes
SHA-256: 7d9af90a569adb4855468429e13e97bc347a8b53fd38c5a962d7413c8f0b94a3
font_02_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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