Malicious PDF — malware analysis report

Static analysis result for SHA-256 348b6606d93b0aca…

MALICIOUS

PDF

116.4 KB Created: 2021-09-07 23:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a07c0e6b9ccc081c9bbc85f1a5682ccd SHA-1: 89202af37ea4c0b060b782a091cf96c8f59839ee SHA-256: 348b6606d93b0acac385f14d805b6c197b7c1da196ad182cce28e446648db4af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

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 http://uk-finansist.ru/userfiles/file/linari.pdf In PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/66569465582.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/poduvobesiwurovem.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210702_36D6F05779E4D324.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9c737c5ff7efff6a3e5137e20edc88a8/68616454712.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/05a7c8531f14e55bf5def4a2771810dc/55180158368.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/kuzoj.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/278581057.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/69681804449.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/lovunibuw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86674573a---zajejipaf.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/13015739428.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/96680514664.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b3b97616c0829def5a1aa6bc78de3e8c/42137735933.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3e194a9e---47404698225.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/k2k8mgi8c7nu6rjbjk72mkc37j/kuwosatogivifevexiperal.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b78522d6ac5---dinewuluzezajim.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40f06b1b66---gewinebex.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/35045637385.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abfeb76ea7e---60479937922.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760794dd584---degaradodup.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/wonatibisadolewasurejukib.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/36852465416.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/75245bf34a9d1c6e2610be84d28664a5/ripiruzugulolozowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=valores+institucionales+de+una+empresa+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_off00015dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000175d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D0 20844 bytes
SHA-256: d32309712eb59929ba776aea714906adc4abf06cd82e7daa7625ed62cc819d73
font_02_sfnt_off0001aa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA36 10852 bytes
SHA-256: 3b55e8c633b8b4360a58d2e218a4298ffeab8362b78c68c08730a0237f88c452