Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d296c2513fac867…

MALICIOUS

PDF

92.8 KB Created: 2021-08-05 22:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3af90c3982179accd05a68ac6df4993c SHA-1: b13bf1ee39f8d7d9a461aa187053aaea30f08a88 SHA-256: 2d296c2513fac8672a4f415a4577b71799837367b1563366db1f91aef50e193e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=mini+militia+hacked+version+2017+unlimited+life+and+gun+2018+download PDF link annotation
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cc3ilm8jgr115ndgn49f8ps9l3/58872779666.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/rilavutefanigojafakisini.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7nqhjb8v3rdai539lb6bu7ij3c/rilef.pdfIn PDF document text
    • http://webursitet.org/Files/file/77203418258.pdfIn PDF document text
    • https://iwistw.com/upload/files/58795331561.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/75365546355.pdfIn PDF document text
    • http://schokozentrale.de/idata/86914002233.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7e06a9ae7e60ab59a9b8ba46fdb7d95/23503048264.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/tisofeponorolofosobav.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/lororagemakorenababemit.pdfIn PDF document text
    • http://pvvc.cz/files/44131612772.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/zoxogowibaf.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/79531022469.pdfIn PDF document text
    • http://navigator-33.ru/media/file/87528658869.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/77717301031.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/bokipotufawezovesonopumir.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b808702543e---mewofelojumakodikigaxa.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/jarugev.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf38d3129---60611005853.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/50669316609.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f17404652---zemeda.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba4cbe2fc---kumamemexemisutum.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zenevul.pdfIn PDF document text
    • http://tcihk.com/userfiles/roraro.pdfIn PDF document text
    • http://mega.kz/media/upload/files/30300036931.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/14381716981.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_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 17128 bytes
SHA-256: 0c757eadd3058a6796e43dc958424724532b1fde6ace97cc3809713267b068b1
font_02_sfnt_off000147e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E5 11812 bytes
SHA-256: 1fb2b7b289f5e8ea66ffe2877d20b3274dae54db9de989d4c443dac0826e3d68

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