Malicious PDF — malware analysis report

Static analysis result for SHA-256 a100cef621170bcc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 10:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3eb37bfa430afea837ea46d0f3c045d0 SHA-1: d7ddba54af896c40cec918c025dfc03177e51fd3 SHA-256: a100cef621170bcc69e5fd99fb4ee845ad72c86a7675a73107aecb5fdccc9604
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161460289f240e---femukamex.pdf In PDF document text
    • http://samnakthodrahassob.com/userfiles/file/77321143022.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/19c43005d13ba5655c43d1a1ea75fa7a.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b9f19f226---73822991754.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/fajazakavukub.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/masitoxomumikitonulok.pdfIn PDF document text
    • http://langmypham.com/luutru/files/xujiwefuwivevid.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/momowagisozepawunegemet.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161357cc016430---7657321137.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/sumirinu.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120100309245.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/77359143982.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/nuduvoxel.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/22049389299.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/kokiberufeb.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/25469590137.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/99856122856.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161445524407bd---38848514456.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905100824.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/23697852407.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/66224153117.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/nuxegadafexizanolikov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=viva+questions+on+scanning+electron+microscopePDF 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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 10996 bytes
SHA-256: 2623dccce01a921e9e79da5500f1a6285aa4f2a7667d1f1c835d6554af521efe
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 18248 bytes
SHA-256: a0323a7aff1a9fae0459ed918909505ff2def5ffe70c6e102184a23eaa0c97b5

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