Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afffcb4eb0c4f4f…

MALICIOUS

PDF

75.1 KB Created: 2021-08-19 02:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 320d04103c8e4a424b8555f5d9e073f2 SHA-1: 590aeadf2c9d30e185aa5e76abf2dbfa0006ee8b SHA-256: 3afffcb4eb0c4f4feee17bf545e7cce0b73a91eb7b025cf98e1bddc5e81a2c48
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3885

Heuristics 5

  • 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
  • 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.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/b2eeb2ea556cbf92a052e9719900fd36/32320399178.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160927187787c3---6287579650.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/68700762322.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39750331223.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790b6e6ffa2---1645936693.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/jaberoxufesow.pdfIn PDF document text
    • https://scalping.ir/data/files/file/nedoxebidowifanod.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41b3ab8c2---31638748788.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/86797164709.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/dijiviwanogejibanejat.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951c8771963---22373420524.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a0219e23---vulugojaxomexikobel.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1549a56202d31503f83530ec22323ce8/20282945786.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wodexeluxinuwisewokasa.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/34362750225.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1628863178.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f82e2d94---28747493130.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/nufipuru.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/aq663jequf611qq0bi3580nhg3/20614014818.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078c75a0f425---dazamede.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/66d6f3ba6b5dd5f559415530ce6b48ce/leburuzabis.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813941e89ca---rebilavegokotepezudawu.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/9962329037.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d695b5302d---toxufixagowukukunitamerax.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/89662296324.pdfIn PDF document text
    • http://servmed.net/userfiles/file/kidazugojakexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=piyush+gpat+cracker+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 11292 bytes
SHA-256: 0834dcc80d0f455acdbbce9862f4e85c6c46bc563af5137918490fb655ab3f7f
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1