Malicious PDF — malware analysis report

Static analysis result for SHA-256 94154ccc9f39a1f4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 07:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a163b166b4f442f14292536e5dcbe147 SHA-1: ddc0189b7f7f6b8d6be5542eab0ba9d084ad2e56 SHA-256: 94154ccc9f39a1f4f129f643ccba06f9bebf3d4fc86a3df209a50b1bac8d6b94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to lure users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=hey+there+delilah+chords+pdf PDF link annotation
    • https://sportyou.fr/ckfinder/userfiles/files/557574019.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/soniwedudedixe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cee770630d6---kolepikavokezi.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/83141591226.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/mufumebisobinobuxanan.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f25b1v0o3rbnnvfulb9hk1ncg1/dojifekuk.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/jilutoximid.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5db12a9e---52836569339.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db3571a1---2654095241.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/27130302700.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609843396b10e---gokokaliw.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/wojuxusapul.pdfIn PDF document text
    • http://kasargod.net/uploads/file/gaver.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/87172060899.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/zazidur.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/misibibo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d4d70d66b43b670489de51ac76a64f3a/sarupakido.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081103301528---62928618346.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/fuwegubetusokawarovi.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/57640515714.pdfIn PDF document text
    • https://bauarch.bg/files/lepuxuxa.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/zobiwov.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/nepunidepud.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/69147218279.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_off0000bb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 16776 bytes
SHA-256: 78860ab6ca3a001ef5506cae5436086a9fee5b4af576757f6b5d9898b5451ecd
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10716 bytes
SHA-256: 91b9d95246bbc842b68fa6e5f4d17e591ffcbf66a63f46035695a4988f772c73

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