Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ceed9cba9bdfa7…

MALICIOUS

PDF

89.7 KB Created: 2021-09-05 11:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c1ed515fd0ed9f1298e782eb5936a2e SHA-1: 64009b5b9b44f5b42564b3dfdb7040e9dc4a4a54 SHA-256: 30ceed9cba9bdfa76cfcca9814769ce83db1ab203291f24e1eeed61ff051b029
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links, potentially exploiting vulnerabilities in the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nsck-cykelmotion.dk/userfiles/file/27301534531.pdf In PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/33963070376.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lijunumupezurapojepos.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/7489610172.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5c16753c94f24f6c82695e32df427e51/kejiro.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/71281125233.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd7bc9a8f---gutegoxe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d83b5d6d---ravuwibuzojonubinotoneti.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/22643092078.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/fopusupef.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nozipisesojojegexuja.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/sagixagelorebobajegu.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jekusegotate.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/liramofulorojogewigu.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/84419280714.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/wafodixofuzam.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/26582215367.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9599e6575---85241891770.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8f00961ab406807eb7eb19314bc4bfb2/kixonaxokaxapexejizajuro.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1a27ff96e93108556289e6b3e9c50bf9/79911118595.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fdc43256d99b2c847f5fd1d006542902/wamopugino.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/65503508661.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/683363aab8d8ca12a19ede59f7d986ad/96248530148.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a201a914---jafadagojukenuwinisigiz.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3eb5305b3be2b43738e8d680c1765416/71727893933.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8dfdf5c8---dalakar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ap+world+history+textbook+5th+edition+pdfPDF 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_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 11080 bytes
SHA-256: d51061a8caf66b1279654e9ef4f6037995fc93dafd1607b8282bf65d193566ac
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 18660 bytes
SHA-256: f70cff8e56f73eadb45f8e4496ff76e60f33906b7c8bcc8bd674cf368fa0d0c8
font_02_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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