Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20a2471bd4f80af…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 07:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25d88a2da54d3ae766320da392042806 SHA-1: 98afb709c9098e1e5d3ab1077914064a8735733d SHA-256: c20a2471bd4f80af10c5691b71139072039b9a2c8e5593a4d60668991131962d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The document's structure suggests it's designed to lure users into clicking links that lead to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca29c5f03---31460559183.pdf In PDF document text
    • https://ht-cooling-j3t.com/contents//files/54089904119.pdfIn PDF document text
    • http://checopharma.com/upload/files/35992503416.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc54b1dde5---81152267090.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1d6ebd5534982618a9229adda93feeb0/nepibugamepaseduni.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906050917.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dmqoqaefgib0glarc6tou629s0/geviwojufebosapovinorani.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/23851208345.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/vukofotekobim.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/81ca3b3875305730bf6bd515d9dfaa05/xuliruzonuxugorixaki.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74675860691.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/tomupunizufalarisar.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/42429411579.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/megaviw.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/juxegoremonigomenig.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/guvipopuxivawawowoguko.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/zugexejulesakawibuwaniz.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d8032058259---zozilipupinatudafi.pdfIn PDF document text
    • https://bczenekar.hu/files/file/veruzupenupusokab.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160702921e7d49---sezugodupolefatuzabofel.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5fca117a---10600341019.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/97341726402.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/67246911146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=platter+ideas+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_off0000b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CD 10268 bytes
SHA-256: a7ca566a290db3b4016f4b7ad3e4599cebb7b9f502fa3f08a3e85730edd52014
font_01_sfnt_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 15572 bytes
SHA-256: 19cfc1430801c890820274d8c30312bd69aa6cf503b7a74b2e1b15815b3e1032
font_02_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1