Malicious PDF — malware analysis report

Static analysis result for SHA-256 674b634f1ce7197b…

MALICIOUS

PDF

77.9 KB Created: 2021-07-08 18:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a87a83ae44d6e86e532707ccddab38af SHA-1: d9e265030b9fd37e9a160117d7be8cb12989311e SHA-256: 674b634f1ce7197b1c8b282bd79b9f745747afbb3ec2d71d04e5ae03d30e7306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging SEO techniques to appear legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/12bed45b2c609a604023068ece314f1c/pilumedatuwuxaxovulonoje.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd9bc8f97---wuwesigibuwiva.pdf
    • http://wecans.net/_UploadFile/Images/file/puwozamajumak.pdf
    • http://berbun.com/user_img/file/8071490457.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h3tkujr13gve4t5jkj6o2g0u11/gavepejekinogobakudonuwe.pdf
    • http://banhangcongnghe.com/upload/FCK/file/47336023509.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1e6a7ecabde4aae70cef464f7da607d3/12501365971.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99972f138e---zubegexafenazas.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/61b97a1763d4bf10c9e2a74fe0f6cf4f/jurekedow.pdf
    • http://angarakshaksecurity.com/userfiles/file/kotilokumalel.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ed68ce3aacd462583095ca265d8cd493/56099412897.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a5b033476---lomixavilibogu.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8a4ffe268b5c052ed8c6c916de0c8ded/48945081176.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c14467432---lunigetezuvetisebunufe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sql+interview+questions+for+automation+testing
    • 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_off0000cf9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 16792 bytes
font_01_sfnt_off0000e7b1.bin
5a786a4ffdfe0b8b00b179493a814fdd6977544c4a49238d238a473d73a7201f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16144 bytes
font_02_sfnt_off00011147.bin
386c1f30caccd0d5fde742a46ea5ddaf7f3b640f5887089511c73927a7d91e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 11028 bytes

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