Malicious PDF — malware analysis report

Static analysis result for SHA-256 765633b5d93721ad…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ce8aebb34dc7333d779f8ef1cf78195 SHA-1: 77bb3c5b8f7dc25dbc2b58496cdc17f283059e8f SHA-256: 765633b5d93721adde94693072f349616eca82d66a6dee31ffda4d67086a5fe3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate it's part of a link farm hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://4bx.pl/public/file/29882418377.pdf In PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/2221415181.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0597a19521---bodimip.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/wofanu.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/72792170306.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/23425411410.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/bofawigumajapefawodexapo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b3f7d3d90---67425549034.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a00bc4a97e8---93547072649.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/35092337932.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/xosititoxuximezowotawu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b8001679---82281029255.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/4741168654.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/df27e4d9856d062fd7642f31d8cda217/wowuxopuge.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/f72n6jh3mav7oocf91a2mnnmmt/29469550453.pdfIn PDF document text
    • http://ahchala.com/img/file/33256622224.pdfIn PDF document text
    • http://valeneighbors.com/userimages/40919225788.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tnp01db7nrksgi17ihd5j2nt53/29597207053.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/mijufutisigukemuxulizux.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/pavogobivazalonesenu.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/68198553500.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3da03768---bifizamezuvakew.pdfIn PDF document text
    • https://andhimazhai.com/images/files/zabulemuwabudufebego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=toyota+ipsum+2006+manualPDF 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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10768 bytes
SHA-256: 9a52d86de392dfd269d9bfd1be8ea2cf19cbd7ca658b2e9031f2b53d7cb60232
font_02_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 17304 bytes
SHA-256: c236cedf88ce41c9e41a2b9d310513a747105843c06ebcfccdbfeafeb44150e9

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