Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d394f2ada3f61a4…

MALICIOUS

PDF

93.3 KB Created: 2021-08-17 21:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d487d342bd0da3614e004e44871ee9ae SHA-1: 1f6da066f187ca94dc8eda943f23c792b4d88c1b SHA-256: 7d394f2ada3f61a45b29766444e6e7a653a4269f52d648ffa656bf191ef59de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or further infection vectors. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qpk3juqq354mj2nk5963hbnm52/99964100195.pdf
    • http://gorisum.net/fckeditor/upload_file/file/deluto.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d9dbfb59---41187501498.pdf
    • http://vwtint.com/userData/board/file/8552468943.pdf
    • http://guoyangmoju.com/userfiles/files/motiraza.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/bemetowute.pdf
    • http://chaukitchen.com/uploads/files/24286995864.pdf
    • http://tuzvedo.hu/elemek/file/xavik.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/21594845741.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/058c03e4241910f03c423ee202b758e0/37354957994.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/91361582919.pdf
    • https://nhachoxebus.com/upload/fck/file/wurovevatavu.pdf
    • https://bcbc3399.com/upload/files/wigejawogu.pdf
    • https://yorapp.it/file/42478097721.pdf
    • https://computerzone.pk/file/69643416622.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e89b6073a---kopisi.pdf
    • http://ks4073.com/file_media/file_image/file/6132852993.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/fufasanepixunanepegelow.pdf
    • https://pjkconstruction.ca/images/file/57414900993.pdf
    • http://tmtechvn.com/webroot/img/files/61514627262.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5b39ab75---kekupufijolaw.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u4lctju42v38pq769fhpgdedhr/linejudo.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/87419580768.pdf
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/xelawowabunajok.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e6f2e8685---34639431607.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5ojj2so6862aqqmb7em6stjun7/sefep.pdf
    • http://www.stuartfernie.com
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=th%C3%A8mes+r%C3%A9currents+fleurs+du+mal
    • 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_off00010960.bin
4115eab75c1170121c2b2fdf5109cfcdd3143fd05ddab62e6159f6ca3d256647
pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10904 bytes
font_01_sfnt_off000121b8.bin
b26176f53c29d7a64ee2d222e68c5ee53fdbd6a37ce414a2a4ef1378a987a84d
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16944 bytes
font_02_sfnt_off00014d1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1F 16792 bytes