Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6737ff590192a68…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 14:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eee8bbdab99d9cd13cb78cea6deb83d0 SHA-1: 8623ed79a0736dedba845991c1788d0a14c48a6b SHA-256: f6737ff590192a6805f57d4cce5d913066d193cf94d6de1a291c4a18eaed09f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure point towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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=bendix+air+dryer+pdf PDF link annotation
    • http://vkts.se/userfiles/file/fikebutanorelunoreta.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/fezugunazujaziki.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/34320581825.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2a1fa7aa8---pedokuzaze.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/k6ln6hp6n9ggfdf95aou5gmjd7/56000909910.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4ed3cb846f9609fe6bafd367ea88cc54/kabaso.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/512q7v41kfmnhhg8fiv1iqv83i/61480366074.pdfIn PDF document text
    • https://italvaping.com/file/wovuwejakob.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/vaxusulokebigetoxaledog.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/80322730157.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nuxutomenavovuvavivezu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160982f83c462c---tonopukisulozu.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/fedadutujewom.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56205d0be---69564640756.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/36293036373.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823abfebeb6---pejolopuvuv.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ba9d417c4add335d8bb5accf870def30/kuxulopufurus.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3da9b426---zeguxikodugif.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7860f5a9---kivosopunozugobukitonijo.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/85454026274.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5644f59a0d---julepapajamufexa.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/vtubeqgj8b695c307s3eemis54/47062596231.pdfIn PDF document text
    • http://freeorden.com/media/file/bovepi.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_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10328 bytes
SHA-256: a91226b1abd4034a7ddeb24a9e12117b86833e0e4eae01b4ace17c5ecc59de67
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 18508 bytes
SHA-256: 1f34b697046d940540a68c06c3300fa1358afff3faf02d5b7fded3c181bc3bda

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