Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7a85268273f12b…

MALICIOUS

PDF

90.6 KB Created: 2021-08-03 16:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d70fbb212936927cb9773e9ff423095 SHA-1: 9a99d7e7b8c9b43617827618b00d8e2928246815 SHA-256: 3b7a85268273f12b6b3ee7a2c06698a5d4152e0b8fc184fdf514adb68512241f
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a command-line context, a common technique for executing malicious code. Embedded JavaScript streams further support the possibility of script execution. The presence of numerous links to potentially compromised or disposable hosting sites indicates a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agcslohian.com/userfiles/file/pilubapeworasexumewe.pdf In PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/224ba9badabbab388e33335a12ff83b9/68605972712.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/45777217572.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/dofesuvadumuwafu.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/12265340043.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/7854038716.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/89023077480.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4f28cfed0---4886770254.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107071227555266.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad645b9637c---75217164448.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a7d60c6028a3f8221b846fc895b20f6b/40841507237.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608759bd44850---95827492407.pdfIn PDF document text
    • https://service-panev.com/userfiles/29808537074.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38d0441ab---63302842070.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c709c627---46454842108.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210730_124708.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/jixorimigetonarom.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10e70e658---94816062907.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93450549384.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8f65b133e---vesez.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/rimoxo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb516cec23---2298796121.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f42437d9b5c---12806026053.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/fezofetikedinedaxasefezu.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/jafigexununire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=master+pdf+editor+4+linux+mintPDF 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_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 10932 bytes
SHA-256: 9ce950feee0262229764f9455b3dab96091180319c60577d9f324ef6d1d22b33
font_01_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 17332 bytes
SHA-256: b7a03fcc81b24a3e221223a5959633e2f8d9e417bc0070323200c7578ad6d4a5