Malicious PDF — malware analysis report

Static analysis result for SHA-256 427be92da20be512…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 21:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27128f3f969faa463fec21cfc286a716 SHA-1: a3de67275fe3449fb307a8c0d01fecdecb1e00a6 SHA-256: 427be92da20be512ac2fb6d750e5ca6621e47ed539343edc4f56103c7ed107e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for malicious PDFs to execute code. It also features a large number of external links, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://waelfawzy.com/userfiles/file/ In PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/38300247180.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bosumenofejewofuvi.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/paxubikepelopife.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/vavojominanorivazazo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/90228925950.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/sefovefenenibo.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0e85a954---55280871367.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c7fd308c7277026c1390d80de2caf990/41944837687.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/86543527731.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tfe10glm70o5k8n1ic7jkgr981/2250114186.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/labedudos.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e787e1ca4e---16482179735.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/berazebesutetimamizaribo.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/89230966164.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6fb5f2ef---ridip.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/537fbbb0da2ddd3071977be752ebf4df/57305746614.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/50010dccf675554cde5a106e687809b5/tikasobofebedesarovedo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9c45cbf3---7849297226.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f7e126ac0---zinabirezowewapo.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/wirubivi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f7bcc0309eadbd45cef01e821fe84581/17779979429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=convert+rtf+file+to+pdf+onlinePDF 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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10260 bytes
SHA-256: 05fb9ef4ce0b254bd1791f33c3b4b493d66c7b2ff03416a0147b954330b68d6b
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 16952 bytes
SHA-256: 2c05fa0e46d2535178b0de34619e8936b833cb236c20634bd5e1354c436d5aa7

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