Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94b36706976d60f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 12:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f20f8d7d0051e0c60d8c80138258fa42 SHA-1: c67c5e35d87b471d79141b9198147c78dbb1181b SHA-256: f94b36706976d60fffd092863359ffe355dc980025f8ac9ea3a4ad61a1ab9c4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect the user to a phishing page or download further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dpt-mh.com/uploads/news/files/27214648326.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/879feb2a624a86473b74bae3f21e82a2/50395089342.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/42444297728.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/89450160460.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/56835756099.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/silunarifugatufusisova.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/43592230969.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/3vs0vbltcjl0uuou7p19at63s9/98349157340.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/69552635239.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1b50b6f01---sabesew.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/snd2b5rn43afilcu1vhfj6hght/gulebexejedotonuzol.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/35342914844.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/16272692181.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/73948788636.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/80952617502.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/49332801656.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1610adb189bc7b---46733392288.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/573da7e177c08d45df26359c94178ea4/81670624262.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ec9d4b7814dc5d13adcc86746a2d6af8/zibojudekovesupunolegisom.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/83943934191.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/37545020291.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/bd86f8798698774f351311c24cf28eee/93580037894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=relatividade+geral+e+restrita+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_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 18780 bytes
SHA-256: b2fc223052c6925a1f8c477cd184b4ddb7b16e9472c00fa6f7ce0de8e9d78364
font_01_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 10560 bytes
SHA-256: 42001345afab04d609b6f13ee0b9aadc3eb5a9611cc16822b36288eb30b7c07d
font_02_sfnt_off0001335e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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