Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8bcc393571f152…

MALICIOUS

PDF

91.8 KB Created: 2021-06-19 09:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6de795a8bb34230fd312c70ef9aba659 SHA-1: 8988e6e01b93671fba4c2ad6adbc4fbf290e8041 SHA-256: 7d8bcc393571f1528d097ae1268e730ed89894dc181727b1e8d60541abdca270
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no clear textual lure is present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c22314b05---mojiluxavukoj.pdf In PDF document text
    • http://randalljroutson.com/clients/44711/File/13297804571.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f6683469---vopapabarawewamiw.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/67470672869.pdfIn PDF document text
    • https://examonline.org/examonline/userfiles/file/78768522410.pdfIn PDF document text
    • http://midel.me/userfiles/file/sozaxanorasavavuzu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b974d7a5e55---32458982601.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f9ce8257dd07bab9317e15a58fc8ba0b/87827927561.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8229851cbabc0736ac646690f284f853/19713704828.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e4c8e4de---pixoge.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/27c468673562fe0dac373d9f7cbbeb9f/metokudifajisus.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/id1noahta6pea9ucnlqpf6i807/80480190334.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080876b80e45---6271783572.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/4832494416.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jofewogowotodekivotixodoj.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/xitamifomasabelanapuv.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4b316d2cdeb713f81d4119d66b66cc0b/75788498359.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8c2843ea---62409923816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=honda+v65+magnaPDF 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://scripts.sil.org/OFLIn 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_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 5136 bytes
SHA-256: add10a9cf6a379adb9dbc0a68af1c76f4a7dc040efcc31144f75915a4951ff4d
font_01_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 11720 bytes
SHA-256: ccb690a170acf6079283c1d86035a8836fa73dce3e74d52e32c5c39b94d3003b
font_02_sfnt_off00014dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD2 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357

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