Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9004c2f41f74983…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 10:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39a8c049cd5b90fedc1e4d2bc8c961f6 SHA-1: 82028a6b5a435959d18cf908cc92c9be613208a3 SHA-256: e9004c2f41f74983be634648185fcb3a78823c4744e68d5b01e8074e19d66c4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, some pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised or disposable hosting sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maffart-guy.com/userfiles/file/lukaloxebov.pdf In PDF document text
    • https://afgventuregroup.com/cfiles/file/90680288223.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/39cfc8438a12a2a5dbab346ac90525c7/modovatu.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/nowilotikeze.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/45280783324.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/45738811407.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/solexekom.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/zodimebubema.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/jarudovepimonopok.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa077f1d0---wipapibasolulaz.pdfIn PDF document text
    • https://maymac.info/userfiles/file/pikegadapawebifaleze.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/zolosupepepo.pdfIn PDF document text
    • http://splogservice.ru/content/files/doladegiwoz.pdfIn PDF document text
    • https://cubic.is/userfiles/file/tobotawosep.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/87479839544.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/xuxojuwepam.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145049b27970---43238097992.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210906015240.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210902033319.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9148091b0---woketerudemobenaxomekoma.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/73886970192.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b9b679d85d24dcaeb88dfe2800d5437a/gezabop.pdfIn PDF document text
    • http://www.agot.pl/upload/file/bumela.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/vitabivumevipukax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ludo+bet+app+downloadPDF 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_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 18188 bytes
SHA-256: f6cdf1142eef94645c3e22605ae521d3599df618a8ba0c2790f63426be5cead3
font_01_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 10308 bytes
SHA-256: de5a05f498412db5e4803eedd28229d19b72ca1070af90bc37619faab9635d87
font_02_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1