Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e8a89f89b38696…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 14:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 25700067a90646dfc9844fb97f764da1 SHA-1: 7c53447ea8c2271a1ec1f259cc3a9ee7940555c5 SHA-256: 53e8a89f89b38696d765d76a472a3f5372d407d2113a9d40c9a9c19c98193f9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=legrand+switches+price+list+2018+pdf+download PDF link annotation
    • http://phuwangnam.com/user_file/file/wimexisovodo.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/54198323750.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/wovipulenuzuripib.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/79109781064.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4d71dd8b6c697960332ef87ed63155cc/19536247401.pdfIn PDF document text
    • https://soechi.com/userfiles/file/87502337901.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/dovubetotemape.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/batebatepajosiwelafax.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a533b6551c---dixezogagevolovelavanezak.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6f4a61256b1e2bce3de5bd570986068e/petunezadefabatenoj.pdfIn PDF document text
    • http://home-plast.ru/foto/files/dinedego.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c857cde8---mokukodow.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/r2gf9kkcugj1htnraquu792i5s/pozewumebikomaw.pdfIn PDF document text
    • http://mylodge-naoshima.com/53253794909.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/bajonubigazevulu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/27826119962.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/movavitugimajasata.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/kugawozifanatij.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/dozebasove.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/5761633722.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/bakiterusexajalekapinit.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/86ln44f11cfsnciaqamn0f0p5b/mugobep.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/99d81d1d070d5bf9b0c66c2df9277e4f/9477991882.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba32f494fb---gipabesozozufiwas.pdfIn PDF document text
    • 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_off0000b8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D4 11444 bytes
SHA-256: ee6ac40e21666fbac54e39959103655479fb2c42cee3f68d7ff0ccc7d5225047
font_01_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 16424 bytes
SHA-256: e4106a355223c4601c148418f9a0a432c9b217fa7be417e32e18dc2c8438f2b0
font_02_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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