Malicious PDF — malware analysis report

Static analysis result for SHA-256 e767a744f582f8e7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 23:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d13c6a03d7445fe537bf20688d8fa18 SHA-1: c06b256f6271e5e07a75b5a68aaed8a5c1ab6c91 SHA-256: e767a744f582f8e7c7a9635a3cd864d0feefa8a63fbe096e43cef35062920e7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress sites and other disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=messages+app+crashing+android PDF link annotation
    • http://www.la-rocca.pl/app/webroot/files/files/20929002933.pdfIn PDF document text
    • http://ccsl.asia/files/gujoveponukose.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/zuwajetamarovobosafizasoj.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/mebemizaxemuxuzegapok.pdfIn PDF document text
    • https://webmenuplus.com/images/file/pusinimoze.pdfIn PDF document text
    • http://langyupharm.com/upload/files/12174983562.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/daxelesonerowisos.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e327502d6---60144158068.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/84146884589.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/37770022389.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/6262556753.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/34677684156.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/siwudisedagup.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3dc6720dc6d6b0e12dd3e23a5d0a4859/40582707664.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/70951649733.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/15059465969.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/11584821823.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/63071838232.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/mamujoxinon.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///12784225963.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/tudokemulididoberunanox.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/18430545657.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/174bf1759ef889f06042d07a61eaa1cf/xorabobugodezatiz.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/josuvifanakida.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/72101c4af93f4a25275ef70042690f05/92045948076.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_off0000b84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 10640 bytes
SHA-256: 23dbc25dea055d5b93b75c1e30452f2d03fb40307c05a19a7985a16a9c972616
font_02_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 16888 bytes
SHA-256: a062b9e77781de79f258bbba287a0c47c2c966ef650209400131e1c2b4cca360

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