Malicious PDF — malware analysis report

Static analysis result for SHA-256 42aa35e40542522e…

MALICIOUS

PDF

86.6 KB Created: 2021-08-15 06:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd58d46d05a307a51608ddc32b29dd74 SHA-1: 2141f98ce39226f9f82b343817cf4224e511fd12 SHA-256: 42aa35e40542522ed1d171bf10138b90d694af60bf23cb00a5ab4ae79bdaf774
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6662d59a03a64abda5ba9ca06cd71873/38152592978.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601041527399220.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160775d1945d3f---50729579888.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/delerisop.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b927ea62---96749584274.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/rafelijir.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/pefisevadisovijiremora.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/dexave.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a7777a2eba2b647d36a9fd22fa3d5d94/79059773150.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/10828128437.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b84676aa713---lakajejebuxetuti.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/619743d723934dc8dfea0fb7af87b84b/62987527978.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/zuraforurolavojuzozetob.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/71dd16eb52694c7cb7eb2abf107cb685/26025407609.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/dupigulivopawufujulofol.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/27917872755.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/zubibupigefugibubav.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/64783865754.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/gafotidezupogunamomi.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/26377328460.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6435af02---dekux.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/fenerodonuwodagu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bbd7412d---kabodobawipufikumupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ver+canguro+jack+pelicula+completa+en+espa%C3%B1ol+latino+hdPDF 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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 17532 bytes
SHA-256: cfe489ab6c807bf5b6c6a69c9d51f76cf2d1231ec96544b9f5e5fc695dd0a2ce
font_02_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 11460 bytes
SHA-256: 1deb59debefb4aa3f6743ee2e8442c9212bf892a79dfc09998b33b89fc4eb0bd

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