Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23c1e47884e3371…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 03:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61447beea3fa554938517b733c8eb063 SHA-1: 1d4a7ff1bfa506b2d5e84fb43e2dd55b3b5e48b8 SHA-256: f23c1e47884e33717e7632d3a2b65f6bbcaabfb366a12e3f92a0d136379a1110
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 are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=best+crypto+exchange+app+for+android PDF link annotation
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/kolog.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/40699363302.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/neponabuzig.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/rozunopabijopamusikeli.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/75252858854.pdfIn PDF document text
    • https://servauto.fr/img/user/file/xajiwifinopegewezebibogur.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/75355738716.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b61b76610f572728ac35a5544b536c5a/gebederitobe.pdfIn PDF document text
    • http://agilesolutions.in/uploads/4262587126.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/50101185895.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/pagomaf.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/10555847544.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/47897824289.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd532e7f3---nobuwoxivivazufurikixuno.pdfIn PDF document text
    • http://datxeninhbinh.com/data/dulieu/files/zujegesatib.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/38842974519.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/delivixeku.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/67574454503.pdfIn PDF document text
    • https://brod-plovdiv.com/images/62369428760.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/vufaxebewunofizini.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109030802403352.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xeruweroreweziv.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/65759994992.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c9ad3bc9a6dd3f5a9e7f625c14be1481/mekalezugu.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/wixopiwozogagovolefab.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/zanorurinez.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_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 11120 bytes
SHA-256: a74a80dbb083b28e9b706400f0e753baf3f4dabaf40b8c94bc1709aac6501317
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 17020 bytes
SHA-256: c5b72c61a3e49aca7d4588585bcb85caa6fcfe35b74a4bb53c2da2896ebdf388

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