Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2523d5e2311654…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 217f5e01e7d7dd272faf56ca3a158088 SHA-1: a6f847ef334b780c7b2fa1827f0790ffdd580669 SHA-256: de2523d5e231165438f4290561d103b7b841bd927ef40f7a1dc2b3c462b1daf8
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting. Crucially, the document includes a lure to execute commands by instructing the user to copy and paste content into a shell, a common technique for downloading and executing secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://martonaroniskola.net/userfiles/file/24234551130.pdf In PDF document text
    • http://cestovni-postylka.eu/userfiles/file/voxeriregozolorugig.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/13077349914.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/09d56da2e9fba2b7dd80c7286bd9b5cc/25876503947.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee4a64b7a---61901853053.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13ba12bf3---53319109389.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/tejajumedibejolupen.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/faranuvawu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074055445873---57623763711.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/57808311919.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/58444728380.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/58384548454.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/30b5f8c98d151999d8fc21684f1e330c/segaxonuvifu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sejilezeponeluros.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/20089bc7956eff9ae48d603a9b3ee682/gegenoxa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611de55a1e263---96802474085.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/mizalup.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8622616b---66417795836.pdfIn PDF document text
    • http://epmachine.ru/d/files/94574150704.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814acba3b3---pixegi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf74f29efe---selunatanat.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/6342330675.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/fosumipiwutavupuxafidiru.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/40agm1prhr65iini3ufn9t7dpc/mufidavipesuwuzog.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/5122199686.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/kofazafevirodotigul.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210823_190604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=combining+2+pdf+files+on+macPDF 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 11056 bytes
SHA-256: bb4f84346ea16015eae4805475149cd746559e509dddd4916caa5ff1ae68cba2
font_02_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 16648 bytes
SHA-256: f9a655f4575efba2df443050f6b35b6efc63e3b6404acfc1a64b7a6e5655f987

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