Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7e5fc07e80a6c8…

MALICIOUS

PDF

107.0 KB Created: 2021-09-02 12:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8533763cb9716c23d6f8b5f128ce66d4 SHA-1: ca45768367d4ba869d6a146ff6e54b658ac40926 SHA-256: 4a7e5fc07e80a6c82f50065f2297065132500d7a9e5603985a8dc25e692fa28d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious code. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://coretry.ru/uplcv?utm_term=learn+command+line+linux+pdf PDF link annotation
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f9fb28cc4911738c82be89451a2d5702/28157821945.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/wevegifasuv.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160820d8b879d4---32092182520.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210830120845.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e473f67000---virabedabav.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210802044139.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/21062304506.pdfIn PDF document text
    • https://bor-diing.com/upload/files/kakosovesibale.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/45447798880.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/zekiwegimazixewu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109b9e85cdb4---99174341787.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/178449509506f01b06c16bcd2e55ddcd/setikarepobaligero.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gudulu.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/taxuwukijifikawemobewanu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210611203210_x1voww.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/dosed.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/gepasevixezegotalil.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/3934472762.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/vitexutapigivogogirefab.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/50042127236.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607324f80d6db---kaxow.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072503033166.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1ca0de44---dukizukoweb.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_off00013e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15613 18472 bytes
SHA-256: 600ec01631752773904a5efcf9216d41de5c347d41f5e98eb606a848149397d8
font_02_sfnt_off00018673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18673 10672 bytes
SHA-256: 85ef218d585e9c9ca13aa7a3bc750d3571f15b648de5563608d4ef7d75f832bc

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