Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ad34316d2b4ce…

MALICIOUS

PDF

85.9 KB Created: 2021-08-29 13:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 22cff5473fa2c78033440a93427bc02c SHA-1: 2fbf712f9566e9fb156c34110200321c10582c7e SHA-256: 743ad34316d2b4cef81ace0ff3eaba1a473f7a6bec53b4e9955a859232db90e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of embedded JS points to T1059.007, and the overall nature suggests it's delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://castilloexterior.org/ckfinder/userfiles/files/64236806927.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b6223f0b---mivefudup.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/38780451064.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/rafajesobukovimunasaluno.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/86367633170.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b161cc53a---15025814623.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/45535749059.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/kizemalosurut.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/r900e2n132tuvn1qjksm671oq5/pixivanudufujetilumubopud.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vumozisexoruvuf.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/78886667246.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/n37glkiuqro0m3dofng3o16m1f/69781120894.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/76903213780.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zusidijagutilomaniroledob.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/riruxenut.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/jojajigukegutotuwove.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/jivivo.pdfIn PDF document text
    • http://haai.org/upload/file/16102771476.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7e1a282f592a2be39bec691decabfad5/4806563679.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/pesubenawovo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8030e127f4---49058274945.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/67440027219.pdfIn PDF document text
    • https://ancoraeducacion.com/images/47664993664.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/47603393077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=you+did+not+understandPDF 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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 19616 bytes
SHA-256: 1b4115422ea59c39230d91f44815487497baad70c786d25982e38ad4a4ec5a9e
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13238 10276 bytes
SHA-256: a622a435ee0fd6daf210280c57de8f5fd5235207d889d63e3a4418b2bd9b92a1

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