Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbcbe08fd2f5ffc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 22:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2d2458f8ed20fb18da01878d3efb058 SHA-1: 291d78d873800d5dfca36084ff553d716aa7cf37 SHA-256: 0fbcbe08fd2f5ffc17f97a068a7064928e2301493b80237c7d43ca3820813135
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=words+that+start+with+the+k PDF link annotation
    • http://hichipper.com/hichipper/uploadfile/file/2021092221064973499.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cbn74hripb8gvfvu4jv6jiiaad/927145868.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/98049814622.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ocoshbbr4p2aeosqbll7hh6sc0/74333647803.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/84361063446.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/97314060275.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/begelafejidoneju.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/fanijeponixuz.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/kenajirusogafijudi.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/dejaberadufune.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210919_BC51D0F5011FCD8A.pdfIn PDF document text
    • https://10fci.org/userfiles/file/89322825670.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/96855922950.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/winewixaporakip.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/givogakimefaned.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/semunulasel.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/98071446182.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lebugogugejizozojetu.pdfIn PDF document text
    • http://classtool.info/upload/files/50741878250.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/43950253470.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca76340b4---motoleli.pdfIn PDF document text
    • http://scro.ru/pic/file/latigefifavafi.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/lonevejopixijupeketu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/gamiluzomawowa.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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 10368 bytes
SHA-256: 7dfb2d094bf7e6873ba4de91e17ba34a85b6fd63b2fb78cf54e43ca215e96d69
font_02_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 16060 bytes
SHA-256: 80f626ef94cc217eed5d3b6dd8a24653beb2d4d7cbd3625f920102f4c3693d93

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