Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3f0bb845fd9388…

MALICIOUS

PDF

83.5 KB Created: 2021-08-08 21:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16650592594243b4fd5ea22199fb4314 SHA-1: 0bfa0762a3321ed9432db59833bb2ab35c2b95d3 SHA-256: fe3f0bb845fd938877cac3ee5e487664eb8d95e09d7e065c94d4ebc1d0b3a0f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. The embedded JavaScript stream (PDF_JS) is a common vector for malicious PDF execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=force+and+motion+worksheets+3rd+grade+pdf PDF link annotation
    • http://adamlegal.com/userfiles/file/57470273667.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/38837449830.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/80288846713.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/26078700644.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/wotubo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/bisirewotajenuzaluw.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609098562b4ac---67401020289.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/aecc763da2989e1917d6aa924122cd7d/soxidepomo.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/kazisutomobukozepisomovak.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/82387586077.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b7a3eee7df76f8524ca9479da8e8f7a7/63189977074.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/zatizasupazodepusewob.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210508171015_139295779.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2ef24190---jupazewukemezasudajuwon.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161002db354a84---bovodufago.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/rijubobojadase.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/rixubikajupabetakuwanix.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b5a77da---43351707899.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9f1a9ee9e817ce03bd8b84f5d8ed0a77/senemubuziribelikamise.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/4omv9emtor8rjn14ra1h5tmu4v/5586276931.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e888f25d5f---buxax.pdfIn PDF document text
    • http://momsystem.ru/public/file/20825661731.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947833ee631---91503578081.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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 11348 bytes
SHA-256: 8c194c874cc4440c26e4221bb43441e1a59b7f4cac1a4875008d441eaf3a5a90
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 17092 bytes
SHA-256: 8879c63ebacc06b463fefe61b80866af1f1f593da0df3bfb26b9bc188560ddc0
font_02_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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