Malicious PDF — malware analysis report

Static analysis result for SHA-256 05daa9299be7a6e3…

MALICIOUS

PDF

69.9 KB Created: 2021-10-09 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf5f39b5631ffb68143c04e860229f23 SHA-1: 0201ab53c89217c0caf03d218614d1e6d7bb3821 SHA-256: 05daa9299be7a6e3fb732e5bb2adedb964cc9d69ab8993ee4d34282ae8006780
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jar-ted.pl/file/pomusabibevagopawa.pdf In PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5240e0e574de05bb7d34c5a75784ede2/93684637596.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebaec8f42---17441455105.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/bozivapapit.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/u1v9tp9k8dq0rl6q88hkfefe47/xekigidodukilafunizamuk.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gowibovidugejudomip.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/33455438942.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/wujenekifujikujoxexe.pdfIn PDF document text
    • https://angkalaris.com/contents/files/vefevekusajovine.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/wudebe.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/binojowagug.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/dubenabunijojomegak.pdfIn PDF document text
    • http://lactopad.com/uploads/files/bugad.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/34245870053.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/19103594578.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/47019174830.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/58524241774.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/newilujopoguxuwiparirag.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/ditejavazaremawonasusefit.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/95937657301.pdfIn PDF document text
    • http://biomehl.com/images/content/files/baxapirok.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9c9379d5---78554853325.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/wexuzaboviweloxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+add+page+to+pdfPDF 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_off0000b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 10240 bytes
SHA-256: c450e9b77ce2bfcc243be7ae3ee09df8d3787e74af129bcbf0211e0142bf6b39
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 15788 bytes
SHA-256: b33ea0214317d33e33c92fe06eb9915a75fb9c0ec2f8adee38045811b29733cf
font_02_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1