Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c10356085e4c2a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 11:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4704df62cc15b37066b0e6cb2da330e4 SHA-1: c63397d07c9e8c465e6c5e8c73dca728c0b1c1cb SHA-256: 67c10356085e4c2a7778ca1a605ce0132ffad581d65bbed7c27667443e09ee22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/1cc744d66647adc63fbd2de9178c62f4/90413293460.pdf In PDF document text
    • http://archissimo.eu/userfiles/files/1659015689.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/nesamisutororosutikuzoz.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/89203571533.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/75892490295.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/12509911716.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/puzisanulida.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104beae79a38---dipofexifaguxapega.pdfIn PDF document text
    • https://actor-conseil.com/files/file/segapogepiwowolinuxojaxot.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/17008264080.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/rabixoga.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/penoma.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/juwipofojakukerexiwaxokej.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/30490754017.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/sosidewi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4ak78dt7ch6f6rf05qcsh60o9j/3332277916.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/sazebemu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca5cb4cb3f---fibav.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/91232713443.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/78829991782.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/popal.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/50856725746.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c338ec45---sokumuvunufipuxi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1e5dcc7d---14656690117.pdfIn PDF document text
    • https://avflash.nl/upload/files/lapekidikaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=copy+text+from+pdf+on+macPDF 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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 10724 bytes
SHA-256: 50611c329ce17f407444fdc761afd00c68c45f79a86c5d82d07154cdf15ad459
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 21900 bytes
SHA-256: 1d4b9f37fc4b9abfd5be0bf84cec55287104f6fbc1190f15a15a77c55679105a
font_02_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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