Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c933f57e58bdf6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 04:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faf2d41b4677c8fd1eba9d19dcd5afe8 SHA-1: 810bb75d7d76a6fbfd4f93ec031499213aa86247 SHA-256: 34c933f57e58bdf6c7e0286a0c05165d20d4014a1678852ec3dd0f13f9e26b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a link farm attack pattern.

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://archism.ru/uplcv?utm_term=the+smoothie+diet+21-day+program+pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vmlcoka47h12aa2d2c8igj0leo/41024846540.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/kuguvibiganusosazuripa.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/vodopumo.pdf
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/13703573328.pdf
    • http://goref.ru/files/file/lafugesik.pdf
    • http://aire-limpio.com/img/editor/file/tonuwajew.pdf
    • http://cafesezony.ru/fck_editor_files/files/nadifisezamuxutitab.pdf
    • http://softtox.pl/new/userfiles/file/lijiguku.pdf
    • http://euroear.eu/ckfinder/userfiles/files/12539628117.pdf
    • http://sys-svinding.dk/userfiles/file/rogatesigotunizetoxim.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e6ada490---fejovafumojavoliwivo.pdf
    • http://www.ferm-matic.fr/upload/file/lenutovajilukaxa.pdf
    • https://prestinireedcorp.com/userfiles/files/liferurukumulivasaziz.pdf
    • http://fdscience.com/UPFILE/userfiles/files/vimovagiwivexefuzejabeba.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffac4e4e62---rejijejat.pdf
    • http://pospatrans.cz/UserFiles/File/kakuriwovepiz.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/29862308268.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160725ff617d11---xojenedepomudulaviw.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df10394aba---jusim.pdf
    • https://mgogs.com/mgfiles/file/zufokemarajazowog.pdf
    • http://innospectrum.eu/hirlevel/file/letoduguwamofusuji.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/wexobumemujunaxa.pdf
    • http://santamariamikado.com/uploads/files/tuzodixakipuru.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/60622946954.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb0f.bin
bc5f8753f71a0b388fc3fb98d28264fb0c4a8383ef837e7dbdecb89f78f8e1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0F 11080 bytes
font_01_sfnt_off0000d4dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 16792 bytes
font_02_sfnt_off0000ecef.bin
34757eb6b820ce771737449cd3d5c1832e6f18444c4f62315806d2e7d2d28044
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 18088 bytes