Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22161cf2c6022bb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 01:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3b5fee1909a59ae3b58ed18835ab9d3 SHA-1: 2c33b2229a59cdf4970d95e1b49a0c740ff53639 SHA-256: e22161cf2c6022bbd6703bbfcb168a2bcf9b6a099965b33b2d98ffd6da2e24f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various websites, some hosted on compromised CMS platforms. The presence of many external URIs suggests a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=free+mindfulness+journal+pdf PDF link annotation
    • http://aptekarynek.pl/zdjecia/fck/file/lugira.pdfIn PDF document text
    • http://esistore.be/userfiles/file/50743924342.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b60c21ae---49150560082.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/29399009985.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/sajuguberizapebujotu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f54e1dee566---89523710465.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/fawawigexexiri.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/kajalodutope.pdfIn PDF document text
    • https://mmszke.hu/files/file/414732184.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/92734213961.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/56737916261.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7qde3hgkbchcv2kgco8455fed3/kovatefumopif.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/90205824845.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/xoseno.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/33d9b3c996c828b6895838c649f98644/62326203583.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/fanumoremuzugab.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zatiduson.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16077647b813eb---41952657537.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c82a5a619c26326a170ebcd10ee42033/zejesonive.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ihh9r15tlohgdmphoe5crkpgdm/pebefowesavonowan.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/aaf57c96214ab97c8b9c9fc9541ae123/29274502112.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b16d478ec---pidezagifalif.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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 17600 bytes
SHA-256: 45272b2a92206b801ee186adbbc9a5110836b07f684cc02f79316e29896ee710
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 10768 bytes
SHA-256: 816dcfd60dcfff7b7a0ca36883e0b971c22bfb21ebd8d537042792b6e80b0113

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