Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f037b6c87753bf8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 20:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e9811a56492f52fefc5b5c46f62ac0a SHA-1: 2e774b35a11a11866b601f54425badc00f362e4c SHA-256: 6f037b6c87753bf821b1bc4e94b81c6a2a56593ae7f27c8f6c7fa376ba6c6de0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains, some of which appear to be compromised. The primary purpose seems to be directing users to external, potentially malicious content, rather than delivering a direct payload within this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://grandhotelbulgaria.com/userfiles/file/37446044366.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/diwisiv.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/nusuzuvifumipogusutorori.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/degujoloz.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/36b7b7055c83a8f89e17f51b99d96b7a/sevigi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4dcf13772dd449962e2b0b32be969ec7/96058480617.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/xiwemijogifevesefivigefu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c9bccd7c3d246b851b3d5c4dcb46ef55/zevekekor.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/95072028832.pdfIn PDF document text
    • http://contextuae.com/resimler/files/15359863390.pdfIn PDF document text
    • http://tulga.ru/editor/files/bedavebidifelu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/luzisizifajurewetafejoke.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84661f114---gutokefiribokozuka.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xojusadevoguno.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1ca4aebfc8b9ffd2328f55593ac8b62f/wobogoxiwadudokutov.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/21215143427.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090237dbfdf2---gafeguzabekaxutigelesiwug.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gapizodurufam.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/dopunejetunajes.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/povum.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64915104085.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aae0aec3c---64045302519.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-27/images/files/24099070680.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/bediwuwuzijojivosumanaxu.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/petixer.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/51735a3b04663563efc25722302b5514/bukoripawoxukenasegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=key+to+high+school+english+grammar+and+composition+pdf+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_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 11256 bytes
SHA-256: dfba126c45c719d7cd0c1a7b02c018210b7447ada06fc42ca72973c11f63d7f5
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 19116 bytes
SHA-256: 22bdf4ee79139f7ed6e3ce47923d0b7b655068eb3291b6d8e809e63cc5088c79

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