Malicious PDF — malware analysis report

Static analysis result for SHA-256 be21ad40992b7db3…

MALICIOUS

PDF

77.4 KB Created: 2021-08-18 04:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e29e38f632acd220016e8e56969373cf SHA-1: 2d5d834fa4e0dd0c59f6a18116e3f143bc271a48 SHA-256: be21ad40992b7db387bb91ba21db4a39e095801dd62719dc0a9dfa0a43a50114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these compromised sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8e3c33c0b03c58f675eba4913bc04126/57337988244.pdf In PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/favaromepobituxedes.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/86140517605.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/62611180649.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c8e851a44d112cd6f5c0f1cd60b2128c/61833692288.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf41c548f---33888563455.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cgev465l4kfimt5f82s7uumg97/82468824000.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/goberajutepusijexazora.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3f45b7912bb76c4d50f70eae832a8a3a/83533383688.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/to66n417fi99okc9qogo9p3ims/vozesiduwaripenowurumop.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01d10e25da---dedexejotiwudejapemus.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/13747196055.pdfIn PDF document text
    • http://turatabor.hu/media/dipimu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a9a1ef58---72232938418.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/470ec2f89197f3a494e34966e9d11123/2614409654.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733a2d15436---96306074182.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/luxomavazugaganapetis.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/83762228200.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/lh22drcustbj6ren9q2b7rb4d9/53858521102.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kobekuxudis.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/xikukanavon.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/75178471748.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa08fe4204---85692367688.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5866361510---sofaletizetutuzamu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ptl2d166hpu22jqgv36ouhir9g/vozedolunik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=holt+algebra+2+textbook+answersPDF 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_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 10720 bytes
SHA-256: 674a128c2024df2ddf1b3074ee15dcf6c4d706ee1f8c9678da896c5da4546766
font_02_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 16180 bytes
SHA-256: 7ec52c9bdabe8ac35b5453123c7f903ed8516c532fb22517d0dd61e604ecc921