Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3bebad3e7abf08…

MALICIOUS

PDF

95.6 KB Created: 2021-10-09 11:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 015f0dc19dbc9053c6e57035d52b14c5 SHA-1: 4f3f6db9869248c03005d013e9b22593c2239a87 SHA-256: bd3bebad3e7abf08c2b49dfe12c0fcbd8436782909430f5d01093e86ebc290e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through a link farm. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=fifty+shades+of+grey+book+download+free PDF link annotation
    • https://pkmoscow.ru/ckfinder/userfiles/files/dujanujaxatotafibo.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/pakinopijadod.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/25280032357.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/91137371222.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/36956893961.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/lododom.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/73038399264.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/xusarot.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0bfd81eb---simikogagarabilenupe.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/dokedojiwejetijefudib.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/nezesesijalapafajiw.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/ripakelamijitelapara.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/wapiriginibibuzewinusad.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/65916856599.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/lorapilomuwadososo.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/32579383683.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630690413kufepakaxonexupazovosawo.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/67341687139.pdfIn PDF document text
    • https://ivanamihic.com/files/nevisumuleso.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1a565c4c---misejapenebuvujokagor.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/zodolovil.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16160b77596705---regej.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/pibekofofu.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/pavirebezosixepe.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_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 11044 bytes
SHA-256: 1eb584f9ee3022c4d711cd65d7db8d9093b81b7cfd6fdbea5aa9d382f82da673
font_01_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 20528 bytes
SHA-256: c21a24112a9fd08674c26a20ee03c0325502936c6dc0ef6218ab7267c7de8f3a
font_02_sfnt_off0001583c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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