Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c046791c05244f3…

MALICIOUS

PDF

72.4 KB Created: 2021-08-21 04:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c2b086f9cf4b24b5a28b29187ae4d87 SHA-1: 08650419d08c9577dd6528029679c74d4416ed73 SHA-256: 3c046791c05244f3303fa02ba50c14a05839d00443e8a2726254c0bcdd3d4ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=concept+of+function+i+ready+quiz+answers+level+h PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k2sff56m4cdlrfabmgnnhv1mh1/86608664339.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/lenubinizalupegimoxupaj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080845e18995---fasatukifaxovizofefejen.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/jodepowu.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210818071441.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c333bc3343---futadurujaluraxamebiravu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/86919116930.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/masuko.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeeaa8091b---15002979794.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48856d963d---36458116159.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cd67fdc1---34194518175.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/61238964493.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b754a5c163---69000353136.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b21c811e0340d4b78f971e1400b9f639/bizetuxomebuzividi.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/dijiwileviwitogewaro.pdfIn PDF document text
    • http://tyextractor.com/d/files/79613693630.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8d0a56db177c8a627b0d4af59144e790/nezanovozesudubokexewet.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/vevovozogikuzetezon.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/begibafovobevuwapu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/xonol.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nelamerurum.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97522803199bd095f901f3a5a9d6a75d/98970051761.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bagaxajijosufaguwixakor.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3be56e6a---89574360280.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d36808fb---muxenerotogoxexem.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/11837261072.pdfIn PDF document text
    • 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_off0000b9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E3 15360 bytes
SHA-256: 45f9a18bedb4799cfa40d39fa95d6e1d36c18113a60585123888db8bafd57ef3
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 11320 bytes
SHA-256: 3d9deb35830c2901ebab0c2a815a353aadd71360a374a5ad2bd6075eec4aa4b8

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