Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cfa3f6b3621895…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 04:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cc10f6cc31d81aaf68272ea231521113 SHA-1: c6ca37250f182d3784a0b4b8752fd02fb5c5651d SHA-256: 12cfa3f6b362189587efc03011396d531dda1a853e9e45674548dd2b444030b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple links pointing to compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a link farm on compromised CMS uploads and the ML classifier's high confidence score indicate a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ubranni.com/uploader/files/rivavumowoturivajexuxo.pdf In PDF document text
    • http://opersan.com/file/sepanisezanimetevesepas.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///nifipezakitesarap.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/2907619499.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/wafavase.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/fovexibipasebulakixado.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/dekimuwopusot.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/17553400256.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/95102117683.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/15158097203.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/nibamotuzezaxerituli.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/64256870980.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/tasedojuvidodikasizoxe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uvmnvgrrnt3pnafqol83hr7sj1/vixini.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kevidifur.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/befej.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489cd8cb1ee---fasunoviwixowujotefixede.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/wutoxi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16148bf3448cc5---tatupusulosavi.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/numawoxojijitadan.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/36261587853.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/kexezebepum.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021092110570880554.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/mowawazotidukamoxolipuxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+the+amazing+spider+man+1+apkPDF 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_off0000c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C8 16604 bytes
SHA-256: 5bff52739acdc92418be5d38295699842cb8977b9d039b668381d31bb597fca6
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 11128 bytes
SHA-256: 5c0e2d59f175fc8baaf1c45e0c72571bc54e429c5fe0696ab1fa1564e3bd4ad3
font_02_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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