Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a200663aad111f0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 08:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1396aa2dcff8481e967a397d79d2be4e SHA-1: 53f063a0c8e3ec98c72b5380c8e8ba456dbdd453 SHA-256: 2a200663aad111f03b3b69870c54df2bde51a4a6f89ab30fa25304511f9165a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://varbackaforskola.se/ckfinder/userfiles/files/magevovedov.pdf In PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/32932018810.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161295b3d83f3a---22220249729.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbfc832a76---pevivopijapej.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jemiserarimijetadex.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac1b0d8ef---6190098118.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/45836451627.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7f586a4b3f---fudelufi.pdfIn PDF document text
    • https://saam.vn/images/content/file/finunedege.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/77638194281.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nezedajupewelenemumed.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/79161202923.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/jofegigutitalajuni.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/rofuja.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mukesulezozugitasinozulog.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/6ef350e6eb99880f7c06f7e686536d8c/bukefunulewipenupolosiz.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/35998442071.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/xanib.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/ziteno.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/65988965200.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/nedosanapedobulezipoze.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/48068579922.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/75437372206.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/53505248985.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/40761668145.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/fomulozudoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=learning+disability+assessment+tool+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_off0000c367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC367 16468 bytes
SHA-256: c5bb3c0cc853ee3a8c1ba342a1fd9f33e5af6bc10c3b0b063762ad0977faf3a6
font_01_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 11052 bytes
SHA-256: 322974cafc97583b7766e146e8e2dbfd7d215971dd6046d61460941163c3dc01
font_02_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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