Malicious PDF — malware analysis report

Static analysis result for SHA-256 862f9b69e59d5756…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 05:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b03816fa2b958b319c2fa825c8ba21b9 SHA-1: a15928c22872bd47700dc9e2df97e87763dc8f2d SHA-256: 862f9b69e59d5756ae273f9b332d7a65fa5564aeb3f853a59a51640b431b0fc7
244 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URLs, some of which point to compromised websites. The heuristics indicate a social engineering lure ('ClickFix') that instructs the user to execute commands via the clipboard, likely to download and run a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://pixomot.ru/uplcv?utm_term=where+is+my+sdk+folder+android+studio PDF link annotation
    • https://mkontakt.com/dat/file/99863637950.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6558be05804e40c4026addd5fd92c66a/47989472481.pdfIn PDF document text
    • https://porfic.com/fotos/file/dukutijuzowineza.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/ketipagarobalagirifolowo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/korinizijewovevidalipiwu.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/88584660145.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141aafc8322b---89746790493.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/526347416.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/65215378869.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613566f027c0d---simawogenitares.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/98803341513.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/fepopadeba.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/17116221484.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/tefijavadilelenumit.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/dojadapaterefazofe.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/zotefapotuwarizixusizom.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojisenuxibedanonemumoxom.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/511c41f9800ca82ffde15dabfad8c507/mumutevasego.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/sudox.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/tafanitesazupukokug.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091523714_259125770.pdfIn PDF document text
    • http://twilaw.com/files/files/17748504819.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/sikowomokininekirulixoxu.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/80007532794.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 18576 bytes
SHA-256: 6fb59adf0723735f925be975ee6c836972d05c71f813db05d9aeb560d3d68fad
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 10916 bytes
SHA-256: c07db6d8e9cd8009e59a901b4a77380ac75ff9ab72042ec6abb3d9690d31736d