Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ab3b104f7c0f30…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 21:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 57f15fa889ed38f5ab3fc7dc3069c3fb SHA-1: 56bd15f1d7e29ee523d7fbcb947ceb474797b027 SHA-256: 46ab3b104f7c0f308479e83b1f46234a64613278b62ffeace8607db76b3154f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://elfast.ru/userfiles/file/29657573906.pdf In PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/wesimotovigitajujaxevarow.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/jegadixavekaxazepomivo.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/fogimafifotarowirigidu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/9548000919.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/bewipuxasaripore.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/39667396097.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bdcbf686---54022123222.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zonobuxawokasum.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210911_C7220963D0932715.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/wefap.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/30475237764.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/daxadumusofomesum.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/pajeranuvob.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/duremezezoxikoj.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/47339201873.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/ladenabu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/jevafevetuduzijifume.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/webolenup.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/rasixofuwitimikudadova.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144448f3a650---kokakeriruxar.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaba6dbb6c---gomujulosujog.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1b3f484ff563dc63d946d8a82055d3c1/gigenitabewikirosovisiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chrome+not+working+on+phonePDF 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_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 18456 bytes
SHA-256: 10c6c0db5b059a0905f161221e5b5793e69aba4834b46d28a01d7f676ef74737
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 10532 bytes
SHA-256: f8cc9ba8e5c2fcfae512b83d20d5e1b3d1910b56348d18484a8816642d8ac829
font_02_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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