Malicious PDF — malware analysis report

Static analysis result for SHA-256 5281422a41e2f56d…

MALICIOUS

PDF

78.9 KB Created: 2021-08-27 22:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 151ca366254b048a52bfc74b96dd8716 SHA-1: 8a0955ea5d5413d87d00a442b55a491f6d0dd890 SHA-256: 5281422a41e2f56de5a23abb9fabad0517db9fbe2212c7de9cb52b5c40e4a8e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to exploit users via malicious links, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bio86.net/userfiles/fichiers/zekegafeletafizewezoxipid.pdf In PDF document text
    • http://paliukenas.lt/i/File/1051659700.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/43596599583.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/weziso.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/v8augbp6et28tfq304ul6fhn83/sabulitadusezinategizuk.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/jenukulezoboxejabi.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/adc746ac07856a4552a4fdccbe4cf701/46806562308.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/xesuk.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607829a2d6f77---58534333608.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/kojipovituxolilogun.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/rawinubon.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160846897e0a91---fafofur.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/29799569798.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lodl31a94e4002d2r7lhsihfi8/nirisudasoraxasazuzisulup.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/gujinudaguxuresamen.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210808214409505980wgzka.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e4bdd1cef9c8c62dcf4dc8c72a5fa999/tajomebutat.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b1aa5fe4---63236703819.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/kakelulapaxitukenamali.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8a2e0dc70d70b5e6d50795535032cfc7/nukovagisitonavufovide.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/nugimuvalokabulevanago.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fe8df0ac---zagorakafege.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7jk8juqvivt7ar7utf9l515s0/zaxidudiduwozexozagikiz.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/61935749257.pdfIn PDF document text
    • https://belloverde.net/emailer/file/78076945262.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8962fea8---17692307122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mg8591+principles+of+management+notesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 18460 bytes
SHA-256: 6f909098b0f0925b97e29ead72f12e48eb955fef1b0efee002dc5491ae53aa2b
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 11376 bytes
SHA-256: c94f066fd2678bec83de18e39f0368f6c8843adcc7c62a55f38167172730a0c6