Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50396bc7ca71c51…

MALICIOUS

PDF

95.4 KB Created: 2021-07-28 01:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d0a6a5f0ff10bdcc7e56551d2af73321 SHA-1: 4d9cf873468e7c3503c235ba415ab70bbb55dd9c SHA-256: b50396bc7ca71c51e3e5532378027c6ea26deb3aba03c602ced2d69bbf0d2583
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+app+download+for+iphone+7.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ceresasrl.it/userfiles/files/lobezewovepavekopufudar.pdf In PDF document text
    • https://hzautomatisering.nl/userfiles/file/37927165272.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/69309919615.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/xopedepeledibemexuzavove.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/41056074e8494f48dd1a89aa2c96efc8/zomofaf.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/munigasadefovovejoga.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/kurubeboximevutawukujanon.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9lfcfr09513s21ikl15a9laht/25226130192.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/88994872796.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/terc5u4f588jfpnoe30hhs0506/85415582798.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec80cd636c---99036581931.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/30113140543.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1560d89606e300d7c12dbfaef69f761d/jugakabopugobuzogokoge.pdfIn PDF document text
    • https://windsbs.biz/files/file/88175219922.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d09776cf7---94361749700.pdfIn PDF document text
    • http://tochuchoinghi.org/files/tuzaruzanitaxotiza.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/37846826682.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21cd1dac78a443b0edf6a1bc569173fd/fuxonif.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/vogazelimuz.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudonamezituku.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5dbb48d9---junasojexisofipivevi.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f292ad181d01453f6fa1f47940f5f4c2/bezarogiv.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/53735826051.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/33430373361.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1c861a7d73b1d330d4845f6f58ffb5ee/dakoginonopitimufus.pdfIn PDF document text
    • http://turnyras.lt/Files/file/66672105738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+app+download+for+iphone+7PDF 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_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10700 bytes
SHA-256: 1c3c693b71f3e2b4ec6bcdab60947eb4f2b73c88b8609bc790b4461d89eecd0c
font_01_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 27392 bytes
SHA-256: c5e59e0b15b9d06b5af8cdc089badd2a8787af9d86b02eda111861460a39c2f0
font_02_sfnt_off00015734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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