Malicious PDF — malware analysis report

Static analysis result for SHA-256 971b2f6b66e7e68e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 14:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b39fec81dc338282a6027a26a8e7ef97 SHA-1: bcf9d5a796f1635f44b6d822ed18a17e0f997b21 SHA-256: 971b2f6b66e7e68e70c23335e93ad0bd0b51bb47f9ce0fbc406471f7cb7e9ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or scam campaigns. No scripts were extracted, but the structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=bloxburg+50k+family+house PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jen5f3pv7eqntn2gr0rf5s81d3/92961693786.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_C84110E515F5D190.pdfIn PDF document text
    • https://zhansq.cn/upload/file/98960350248.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090620145973499.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/90256344739.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jukodut.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/54097038755.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/27928555790.pdfIn PDF document text
    • https://halkum.rs/files/suragexo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/zuvef.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/9456472072.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/99561354427.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/xozosiwun.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/33018001918.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cebf520b5---fojimasesosi.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/gewufoze.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/25953305195.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/029f16040dae6a51b4085c0c655265c8/binaxuw.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ro99gcunsicekdbmhre40n9bip/gemidaveworulasubimerovez.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/9521613197.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/63360699873.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/pupezagewujezonawika.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/folorodesaned.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/buvorulesubulaxufana.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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16968 bytes
SHA-256: c1a96fbca9030639bbf4a911f023a35d9ceb10df82141ff8b0b880ad3edacf5f
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 11316 bytes
SHA-256: 1eacb612d5527c088d811a5a58e6d5d9f767d1461126018b7adc9849f5f5df3e
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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