Malicious PDF — malware analysis report

Static analysis result for SHA-256 867ad8bd2463f49d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 20:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77ab3f6f5942637b67df907727a1d188 SHA-1: 77b4425860d2d1d5c70a9644d50ffa1935757779 SHA-256: 867ad8bd2463f49da718cacc468df04098ed3055c60dc60b76fb404229929a86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links are structured as a link farm, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090cce56ca40---98641807933.pdf In PDF document text
    • http://napiarsaigh.com/images/ruveb.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/eb141dfab37f4a22da3cdf12285abdd3/34314413239.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/97338087555.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/81922317048.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/baloguliwagux.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/68487039956.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4bf2ce73---18644261509.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989e447a5c2---sixinakupebuzu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7136269a55---gukijozaganototaramu.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/kotovagef.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/64272016787.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/aa8d69532ac5aa14cdbaa1e687d739c5/40966909768.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/79942292472.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/4995089096.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8b9b2c31---42281862236.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/84316784797.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b4aebe8b046a76779631a29cdc8905bd/85847663043.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/p309les5v6ej2terbr8no5l5u3/16591468946.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/nojegezixafeforomojukux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=exocrine+system+parts+and+functions+pdfPDF 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_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 16612 bytes
SHA-256: c3a67bea2d3185d4b91f2e8fbb8d0d2dc9ca474c490e974848e8069ef92570ab
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 11032 bytes
SHA-256: 253d57686baf1b83f919dfd6374333fe1ec0766e9bd5e05a277e1fe5ec4c05ac
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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