Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b92840c8b82e51…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 13:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67e809908b2716a9be3844ba9d5d83b6 SHA-1: f56163683440f0c579a27da55b6985c2706be09e SHA-256: a9b92840c8b82e51ea48b77168182acfc83e943d513da74bc0c6e43fc61f07e5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for downloading and executing secondary payloads. Several URLs point to compromised CMS uploads or disposable hosting, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://tcsklife.com/filespath/files/20210903043227.pdf In PDF document text
    • https://elger.cz/fckphotos/file/xazuresugazajokazuguve.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630551176.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/97767561323.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/fuvenosowopovini.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wadimipidegobariwediw.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7add2354---kukafiwi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab5629a8d---92516269177.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/17574417531.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/48424841846.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/37966112299.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9v16kghp49ppkiq3qlv5ttsqtr/doboten.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/degenejeweroku.pdfIn PDF document text
    • http://jfe.hk/userfiles/77892823116.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/mufubagobigozigetozaf.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/21928219643.pdfIn PDF document text
    • http://traviet36.com/upload/files/tadudugaxowedatuvazawen.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/77507798504.pdfIn PDF document text
    • http://grandfiltr.com/files/file/11775648630.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/poweguz.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/rajuxuk.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109021008173815.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/48413411637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=setting+navigation+bar+in+androidPDF 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 10492 bytes
SHA-256: 3bc215bb6a66bd300f6b89847c76a5536565057edaa63d6c1e08eebde49774ae
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 19448 bytes
SHA-256: c3c4e24809cc62c98f7dfc3017164c14ce1211f5db55462a0a0e841095fbb97f

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