Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3777515acc1b0af…

MALICIOUS

PDF

96.1 KB Created: 2021-09-01 17:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a08ad02e213db7318845743f691736e SHA-1: f231d0b8de8b1ab265b3b5870e851d197c770fb8 SHA-256: b3777515acc1b0af8fa41cd4cdc4a32280c1ac4729a223320bc53d8a962c85b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, pointing to numerous URLs hosted on compromised websites, which are likely used to redirect victims to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=the+7+letters+to+the+7+churches+in+revelation PDF link annotation
    • http://studionegro.net/userfiles/files/dozug.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08cb849da2cf464d6198936aada77c85/71693905493.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/863174a3a10c9ebde8379fbfdb01874b/82142891612.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/48485958501.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/51003315666.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/62073847086.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/geled.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/daludanoretobamegid.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/kilofo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f290ec346f---75866994286.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/xejazilijopelevekelofetu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb322b48ef---93739977049.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/dc6fdc2a571f9e15df795af951665ab9/pafejoworusinuguruwotitiv.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/25c119f278696acf5722c5e4e6f33ee7/61795838698.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a06b4e21---sotiwipituxise.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/6213598016.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/livuvorimonolabikemobodid.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/49105061035.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8fe28f6f49affc04c9376f3ae67c9aa3/jadawedofuxakifejuwaxakex.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/30182775475.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/75938919051.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/74562377626.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/74558089271.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a619d136676---31284425743.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_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 18496 bytes
SHA-256: 97793032589dc7c227779c5fd9ed5aea20288c790d98bade76f4d542ad13a569
font_01_sfnt_off000141fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FA 10504 bytes
SHA-256: 96fb994c1932d06d0f52e535e9da3250196dbf087a88213d7361df50c045e2fe
font_02_sfnt_off000159f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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