Malicious PDF — malware analysis report

Static analysis result for SHA-256 79896371dc375b17…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 13:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34086df18e0e45edbafc3b429d636db8 SHA-1: 25db6f9a3634641d6a8ec1a7c8472b68713fa400 SHA-256: 79896371dc375b17c5bad1e60a17ae68471bc427de61f975eb94420b91004efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly suggests malicious intent. The document likely serves as a lure to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=5+teeth+extracted+at+once
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160903af398079---memexenazefo.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/81fb3e82e4810c8dae8d10facaeb5e72/9322317600.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836003320aa---85177644439.pdf
    • http://ed-web.cz/userfilesfile/53116916827.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe302b70d5---sulilujixusukuzodotod.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/11e41d3ad111758e3de4dd144086170d/55241760361.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b4919c6610c---bekomekilosabotus.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160720b3087746---buvisewijekawu.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/fulot.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bddb121f40bba61c357c37f71a628a4/likiporo.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5dbb29e0e119007f0e3e74aed0c8ba33/pijaxu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce314614bf0---80571887436.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc93425d15---24256410185.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf1520296---56027843082.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec63.bin
04c66a79d53ab0ee9c4f575779d2608a9bbefe24e14b3ef08b31b160748658bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10300 bytes
font_01_sfnt_off00010390.bin
fd92383e68a625cd089e69c516179d78806cde0c4e2e64c233b2d77fb78ebc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 17336 bytes
font_02_sfnt_off000130a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16792 bytes

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