Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c8a6a9a032ce46…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 18:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98e89f082d3108df0aeaecd61426b00d SHA-1: 33ada6fdf5496df81f85f0fcd768d0e1254748c5 SHA-256: 75c8a6a9a032ce46c0e79e8a72568928e5b99e884e80e6ba7294d76016d92e17
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The file functions as a link farm, containing numerous URLs pointing to domains that are either compromised or appear to be disposable hosting. These links likely lead to further stages of the attack, such as downloading additional malware or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eau-msu.ru/ckfinder/userfiles/files/2322246931.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/saruvipimulidifet.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610babfb93f8f---68512796767.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/18430417336.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210522055819.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087c730510b8---11340732732.pdfIn PDF document text
    • https://tsegypt.com/file/joxakepesuwupexidufarepe.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/2183537723.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de1cbd59620---wodexifugobekelodawibige.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/21754828592.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd2fa7801---fulekomiwalirolopodanabag.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/96928173700.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/jituvigorumaburi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/74758113578.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c4a91860109e37cc96b01b0927a64024/gogopokijozafabebeked.pdfIn PDF document text
    • http://abnicum.ru/files/file/dawevufirosezodi.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/kilagofofoxuv.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/xopop.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/9252866430.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/4348813286.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/wewixot.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b974031cd---nofapaxukodibixaso.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832966c7948---tudolugug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=4.48+psychosis+pdf+nederlandsPDF 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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 18808 bytes
SHA-256: dbc05a4b9977dc3477fffc8d4dcfd687b5c9f6ba6aebce2bfe611c4b15d41f51
font_01_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 10988 bytes
SHA-256: f265f2e79ded294d71b24413006494f862c5d8f1790cb857eb440e62982de143

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