Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4030f42c495fcc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 13:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa6de4dcac2ece39468024cb414b48c0 SHA-1: b07f6c99c15d952378b501005186aca4df75a376 SHA-256: bb4030f42c495fcc4ef229cf81c82deb69c0d8dd73a29602e1810ef83298423f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=watch+apocalypto+online+with+english+subtitles+123movies PDF link annotation
    • http://chrisdepanneservices.com/Sites/cds/files/84314391860.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613c9e92d1c2f.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/muxajuginetek.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/tibatokiwomuj.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/288ec6bb91c69ba4da6d6ed985cae8f3/wudixuv.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/38029450375.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/13440010432.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/jupabetanuj.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/20070564150.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/31725952548.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/24725549040.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/tevojebinevakegetage.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/suximuxo.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/zolivuluv.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ukup9o4t1gpb8qg2hc1aachi11/62035590816.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50187575303.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/6633732716.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/37783638041.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135655461a3f---36860881706.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/10410616192.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/susogujujajibuwavibov.pdfIn PDF document text
    • https://777mto.info/contents/files/83790439768.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_151949.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/geginumarevamusiza.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/dowiverivusa.pdfIn PDF document text
    • 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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 18432 bytes
SHA-256: 9f1cff05b11b039dc11abcea03faa000c96ddaf0cc636020c0b6439db3bffd17
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 11564 bytes
SHA-256: 0f1ad7b2895a75250c9c1ac82c043a546ce28da39b76e71508b1f884ddea4e3d
font_02_sfnt_off00012746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1