Malicious PDF — malware analysis report

Static analysis result for SHA-256 6777c239d6d3635c…

MALICIOUS

PDF

80.8 KB Created: 2021-07-19 02:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b30c43e511fa466fb43ef65becdfca01 SHA-1: 5c6f228dab3cd7ef9901d64d32208b968425a44f SHA-256: 6777c239d6d3635c80146c63a356d210fbe81da9fd2168961852570c365a93b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ddf450b6de1e9677c5cb2d436d018d37/jusijifezator.pdf
    • http://nensi.si/upload/file/vazufa.pdf
    • http://divorce-difficile.fr/userfiles/file/nixebovoziwinanukolari.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa1df794b9---lomibegaxomavomajasamulik.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/3154076616.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/59120082778.pdf
    • http://afghansolar.com/userfiles/file/riziliwidulalefoxawavufo.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/bozido.pdf
    • https://vibangthuaphatlai.net/uploads/files/8688467824.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160867872b6d21---83358036836.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/50340083164.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/17mo57nrv0qmchio329qu88ib4/12818317211.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/kanojarurilem.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b6cd49f5f6220d6b55382f22f756abef/fabutu.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c992ef16---jovokiwodo.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/03aff98c6365d3534e5346230aa5c266/lotefoginidosalerapi.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/v2a58dblko8o3vmqfgfusahr36/xejug.pdf
    • http://duythuc-bearing.vn/uploads/userfiles/file/tunowomijor.pdf
    • http://olterus.org/contents//files/96332000062.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3107e95f2---60193453337.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacbd9a644---fagijare.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u2ul6bb4qj5fs0t6mulf5tvh86/mazukizup.pdf
    • http://vmkmsz.hu/userfiles/file/zagukuvoke.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5fc30f93915d092ec1ac12f3202ecb0b/52018148663.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chemistry+chapter+1+class+10+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d704.bin
074d841cce072cfd8092eb0c3f1b0e7b244267d300b031485fac7d1a6febdc42
pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 17524 bytes
font_01_sfnt_off00010532.bin
66dcdbdfef643409bce90f089e31665f77851cd0ea930b119b54d6c97b0cf19e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10732 bytes
font_02_sfnt_off00011df5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes