Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a72a23aa2fe0f36…

MALICIOUS

PDF

86.6 KB Created: 2021-07-31 08:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 650ce7f396da7253ff3fe3850a0fb782 SHA-1: 83c01e26ca228a36e486de4b252a4442f1580816 SHA-256: 4a72a23aa2fe0f369b4e290696eac45efb36db77f987fbfb88067bc27f565e18
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF acts as a link farm, pointing to potentially compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ce3kqd59b6gn3o9q9imlki64r2/korijuveximokupimajijis.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/dd1fcfca96ad9f080498ea8c14970bcc/lifijazuxode.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c4b339dca166e57826286533956c5b59/puwaxoroxizi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/aa141ba18996a999c7d03d4929828b27/diwikigakuguvu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b163baea0c8---90743647971.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/7014281679.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/69183049366.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9867174245---piramodus.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/27957cb6f231906bdaf03ee338a0645f/sikedenojutiki.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ed45c6c5---sabebedewitajuk.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e985847f82---84563442325.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/varazetifemuzakibezufi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/enoplc0kibgjcs4khjnf1i71l2/fisegikevulipateneso.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d7258e6d---30489382775.pdfPDF link annotation
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb48db6a6049476a76eb5d12b3d0a9de/82654989615.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/jokafavavolinalo.pdfIn PDF document text
    • https://panama4d.com/contents//files/55649208743.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6038f10a---78076724296.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098dcf1ebe3f---toxuror.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210614_074711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=importancia+de+los+peces+en+el+ecosistema+pdfPDF 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 17728 bytes
SHA-256: 7c97d84f8641a10cc5427fad7620e2b96c5bfc6ed7409ed7c7ba22ed4756447a
font_01_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 10732 bytes
SHA-256: be348af0f9353047ad58598857a365440defb7c9802389f55a2f5398ba6a8ce2
font_02_sfnt_off00013455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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