Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1e58adf5d8990a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 07:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01268b55f8353e5a7a5e5211e2e7167b SHA-1: 4a55a2eecf2fca7b95db1aaef9f723ec81db8b6b SHA-256: 9f1e58adf5d8990ac1938b9affdd50077a594c5b0592d4187de72acff3f3e602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://notariocprietoa.com/notaria/documentos/files/davibojipomadagozawa.pdf In PDF document text
    • http://logtech.cz/foto/Image/file/34771105843.pdfIn PDF document text
    • http://selidbe-beograd.info/files/xemofomusamo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/39570418254.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/91107230402.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/gimogizutatudi.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/69065221728.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/77890517464.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/17900921115.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782d4360d8---levored.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/994b1205c2d75633ac588ee5b016c9ee/firofag.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/23827319309.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee4cec9b48---zakikesiwekexadumidimut.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xixaritavedipazife.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/napukozisi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f6e553933502b846e9d693a762a3ae03/tuvobunifoxuramogutaki.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///27404915586.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vizavufuwejovogaweduzisum.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pinuzuferikewiferigipan.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/laxodazekatukuxud.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/996500024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=friends+streaming+free+onlinePDF 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_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 17268 bytes
SHA-256: 5ddc4e02ff1260901f3eec5938eecfc2ea82c104cae3f7ed160cd58e9bc0fcd2
font_01_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 10676 bytes
SHA-256: c54be6b6ce1936ca67eb3db0a81dd58ec3dc63b8fb76bc03db63adcb3b4cb7d4
font_02_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1