Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c9ee5630d14498…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 08:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e145322523b62dabe01d909bd9e0457a SHA-1: 7aeac52f71121f9f6983bbd24ba78dca6c17255b SHA-256: 50c9ee5630d14498b787952049484f99bce51122e10cc812e6b1f5f0789c8d2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites acting as downloaders or redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=aluguel+de+valetadeira+manual PDF link annotation
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/d941fb717d48e0e632ce3f919a3977e7/lelufakufuxesuvumol.pdfIn PDF document text
    • http://pneusmarene.it/images/file/ratepixulunomexel.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/88008328806.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/57052880424.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gisubexewezolajulodufi.pdfIn PDF document text
    • https://jjpremiers.com/files/fitateva.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/xiledu.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/11675224382.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a170850d73a---3342042030.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796a9c0cea3---24497500718.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/i4ionr4tb6ieqm5qlggb2a7pta/nofatomixegirobibiguxol.pdfIn PDF document text
    • https://maisonforville.be/documents/file/sapaladimafijokajoke.pdfIn PDF document text
    • http://anm-av.de/uploads/files/gitatoposulovamaluwib.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a631ed116---54277296733.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/16012980449.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210630_2D9ACE8D0DA38430.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/80881546510.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/6568495320.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/sobekifumivoxulazizevazan.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/60194865802.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kabavurevo.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/31771689883.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/28295497048.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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 10448 bytes
SHA-256: 9d76b7b186f8a7b54bbba7d50224ff099a06a60e88e961735b49a7e2f1298f10
font_02_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 20000 bytes
SHA-256: c88b8a920ae08f334feba8a91f8f2b9f78d7a1b60da3cdf02998237d830d71e0

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