Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fab36a1ee364ff…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 18:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6adbf6d0ef262f3dfa4a004522ed05ea SHA-1: 763f5c97bd2d592fdf2f936cd5a316f4e8c4ed79 SHA-256: 76fab36a1ee364ff0f6603afb0caa9af01165bdae1651e7f09a908e488836214
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. These links likely serve as a link farm to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e731557c---malazowa.pdf In PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/87544352685.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8c5ce49cda3a6a7c42c90308fdc8de67/71541644347.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/7537030062.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bbbf7037ed2f9d2635dccae4fcf0ab91/sivisimuref.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/25452852073.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/puwixuvoxodipuf.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tofuduwiwerifefaposo.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/55240212402.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/35921319837.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be28109492---38739268803.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/kogavorux.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/82f032754df34e6783291b666681690c/tajumigivevuzokubajaloko.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/bilolemaremewigakiroz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2fae6565---dikadela.pdfIn PDF document text
    • https://autoskola-scp.com/files/tonowovuxudazezerudure.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a8d58d588ddfce842048b68e874ae9d2/44374482458.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1ef3cc21---bojakewojaxumaxato.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gojawofajoretato.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/a599hu18bq6ndc6tu3ovcv9e7c/gojevevesubororanuwotapok.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/98162002790.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/lezezunitiw.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/55b2a21cc3c174d0e122fcee60111f09/5984452284.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/26b9f219a3aecb63b91cc4c6e9df08e4/jujoxatimiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=structural+steel+design+abi+aghayere+pdfPDF 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_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 11208 bytes
SHA-256: 96819982717f2d603ebf0ba12a7933bf0a2525c234e670558133a90fd95231be
font_02_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 16104 bytes
SHA-256: f3028b2eabf2e3b30d3d2968ca52154efd6e280b45b683cc7691d610a9f99137