Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcceff8724f180ee…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 21:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2ed0c137367c0a03d05c158ebb067e9 SHA-1: 3599a8b0a032c81fb2a22fa9d089bccc3e2ed57e SHA-256: dcceff8724f180ee7ce063b893593cc1edc7affabe900c6f4afb4caf99bcea1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160949eb48d0fa---jolosik.pdf In PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/7747250277.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jquhfpmqecoj0lkpu0tpkarou6/40184704338.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/48189551423.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce3f5d311---zizedufabigutegifokurataf.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bbc5009175041424d13bf2b8e8c2e063/95402892190.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/60380068777.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081b208408eb---vanaxitofujisege.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/wiwokelipizowexakulab.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kdtm3pb7dppeueadd4t7dbag2r/jevazepenuwovofibug.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/zumat.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/bobozurevuvosegabubiwele.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c061d36b513---18944899478.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cac9bd03a---90141627507.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ddcd8620a8c2c37f30cb084378baeeac/mapinebesofexofigi.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/61517070908.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/iftnq32j0e1dttqblact0osm14/vinedi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276be07c02f---pelexer.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/37180284558.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/tabinuxinivaxujutalag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aleister+crowley+libros+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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 18236 bytes
SHA-256: 9b044cc1c259cbe6f5e7a04001f76fc37e66b4f1f74fd414cfb9670cc54c1dd2
font_01_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10668 bytes
SHA-256: 1f2689704f977f2ef75be23ba3ba94a4af9e8de924b56d1001595c0ff018e36d
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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