Malicious PDF — malware analysis report

Static analysis result for SHA-256 371d502fb4978f09…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 09:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af7ee5ee1b14401287c08ee11db12f09 SHA-1: 80911e4e9fd0bb1f75aa9208573c94dcb6091d0b SHA-256: 371d502fb4978f095ade9754be838d1f642af1c1ea3a2a07f4a6ac33e39cd9c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://efuturesthai.com/uploads/file/21665685839.pdf
    • http://geonatlife.es/ckfinder/userfiles/files/nusogalokosilizo.pdf
    • http://jl-vacuum.com/upload/files/66892330761.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/57048160204.pdf
    • https://netiko.fr/img/Data/file/wuxuxesolanum.pdf
    • http://veterinariogiardinelli.it/userfiles/files/vuwinulekerutojalosan.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6ldnt7evqa8qf0mnu57slrt6c2/88192704972.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/8873475442.pdf
    • http://kojeneckezbozi.eu/userfiles/file/22157701788.pdf
    • http://hadt.vn/upload/files/92467793978.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bea55fc4e---74587947734.pdf
    • https://gbagencement.fr/uploads/file/wurif.pdf
    • https://copacndg.com/images/uploads/files/99143356861.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b2194f1eb005762acbf91eb8788de1b7/xipaxotijufuzibeno.pdf
    • http://studio-orlandini.com/userfiles/files/rorisojus.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e52d444576db2c94beede6466716dfbd/jagasajamenodaw.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/fikug.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210903152930.pdf
    • http://ourgans.org/userfiles/files/14219391193.pdf
    • http://launensia.cz/ckfinder/userfiles/files/woxosi.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/42531244815.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/zaxasilepunu.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/80583a91617c283946e921f5c0ad3402/filalaxitukulizufuxados.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149169c19249---15987163690.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kinemaster+for+pc+download+for+windows+10+free
    • 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_off0000d839.bin
d0ca786ace814039ab0e37829a93b2567ec0e603dea7951e372b3e414aaf726c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 11032 bytes
font_01_sfnt_off0000f1f0.bin
b85ff4d440ca004ae9aac62c85398e8ec4b1aa982052854df4651f7af40e377c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 16592 bytes
font_02_sfnt_off00011cd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16792 bytes