Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd476e596d7e2de0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 06:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 422de12684acf7309b1ffa53f6a0dad2 SHA-1: 420d750bd98a43c40f873d55885c2eed6705177e SHA-256: cd476e596d7e2de06b1ca8f6067619ea22de68bb5ca37d35e1c53a04e014b6a6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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
  • 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://catamma.ru/uplcv?utm_term=faringitis+cronica+hipertrofica+granulosa+pdf PDF link annotation
    • http://praxis-greve-polley.de/web/editor/files/kuxameveru.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xosejufonalibo.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210819_048CECD5D99BFE6A.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4e2e60ab9a8ca81886d5def0738d681c/kamajivupobufusem.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607966f672f11---67086159121.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9878009d---zajikokenuxomaso.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9baa1f86---jolaruduz.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad5804008---gaxetegexawatib.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942e61c773b---22225323531.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/fefipamul.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f622250937d---74891346082.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/mukige.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b965e99f---sonemenagilesi.pdfIn PDF document text
    • https://coluer.ir/documents/file/bivobav.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/43639063467.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7789f5f7---muliliwesatesudiwilim.pdfIn PDF document text
    • https://advik.net/userfiles/file/10367863387.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/pevunujaxi.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/74663101419.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/1672233825.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/25484837774.pdfIn PDF document text
    • 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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10976 bytes
SHA-256: 0c9ddea5b4cb6b55b14569c0b7b938b2e1178ab2f9a88a9d85f8a998e9c422a0
font_02_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 17388 bytes
SHA-256: fd5111cd4763f014eec456401f390f699de0671277c59d1dbc1949248b3de83c

Open this report in the interactive analyzer, or submit your own file for analysis.