Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff77b52d189cc4f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 13:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9d77e1021a0fceca32c6e0aeee01afe SHA-1: 7319654c29c6ac4b95778fd6b83f616ea6daf1a4 SHA-256: 8ff77b52d189cc4fae98404fd243bd7cf15b041b97cfcacda0daf6783a790196
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which host other PDF files, suggesting a link farm or redirection mechanism. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick the user into downloading or interacting with malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://timavoshipsupply.it/userfiles/file/dutobunabamaweze.pdf In PDF document text
    • http://prof-cosmetics.com/upload/files/bavedire.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/muniwumo.pdfIn PDF document text
    • http://qzgj.cn/upload/file/74261971678.pdfIn PDF document text
    • http://www.emailposte.com/pictures/notujowupizugiki.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf398de1d0---dekarivomiwexege.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/wesufeva.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/54658309837.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1d386ba8---kedodaxofigaji.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/872544c61e538bbba303c849a49c940c/rumapajifufelesun.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pehvhc51ffjevuhjsqlo5po483/vifuladugewaweputixasu.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/25529637101.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/t5hiut8udnifrpqcp138gdbseg/jikurupovurewenokodit.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8b83ef7754b511d3436298674e126696/74581044499.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082029e6d804---96019123486.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4df77b5c---piziziju.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121883b06a7d---11545929869.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/lulifagezenanoton.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/65057583458.pdfIn PDF document text
    • http://namngonviet.com/user-/files/48256135188.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/pekilisuzubino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+does+a+solid+become+a+liquidPDF 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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 10692 bytes
SHA-256: 2fa142e9db38c7c1b5ec065407685f90449f2b2be270b6dda7ffd121792637fa
font_01_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 16392 bytes
SHA-256: 6d0118d88a01491daa81b40e8345e82bd324b66ea4acc2eb9ba5f0b691768932

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