Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c89e2f09582f69…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 18:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f3647e1e3f5deca25570426fdf8ac97 SHA-1: e88961f8fcb999af86dd27087503396d1681c240 SHA-256: b6c89e2f09582f69307bd12e32ac12e62654783e77ebe11c28c80d8b49e79844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, though not fully analyzed, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mamap.in/ci/userfiles/files/27600811207.pdf In PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/gudusonazeg.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b8f69649---furov.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/pilowiziviremi.pdfIn PDF document text
    • https://wonkingchina.com/d/files/89713712570.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/72881814007.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/dilanediwalegakigegeti.pdfIn PDF document text
    • https://kimcert.com/E/file/gituselawed.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/pusipalijuvivixi.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210909070204.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/vosekemibij.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/vebokorij.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/serafigazudirev.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/kibux.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/natumikirusaxojigi.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/41975524458.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/36c343b022e7ad42252a70979b9f92df/26127890174.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/71041126043.pdfIn PDF document text
    • https://kimcert.com/E/file/tufowiwob.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f32eefc2---kubutibafekebevugijesel.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/33758132059.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/63815927819.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/1297794733.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/tekidipadilero.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135226a3acfe---65153019905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=a+quiet+place+2+settingPDF 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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 17644 bytes
SHA-256: 7036f6c9c5484cddfa8777aebce1bc9e3bed6be55a9ef3864817725f2d223d7f
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 10676 bytes
SHA-256: 62149929a80eb4028c6ff2b5ca041bd43e8eaa382402a980b77caff75c18ee6c
font_02_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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