Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf1fb0ce20e7c9f…

MALICIOUS

PDF

93.8 KB Created: 2021-07-29 12:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2ca03cffd20c95f30efc461e70583f9 SHA-1: f622464b46d386c7a473b09faa9bfb28975ee0ee SHA-256: ccf1fb0ce20e7c9f97e5167cedf790c5243206292003a1f67b97099790271efb
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of a 'Password-protected archive handoff' heuristic indicates that the document likely instructs the user to open a password-protected file, a common tactic to bypass security scans. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=comandos+para+sketchup+2018 PDF link annotation
    • https://facades-et-traditions.com/actualites/file/19385190687.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/11714198283.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/590cse2udmpkd3p53os7rl9p98/24791605384.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/kiruk.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/54638632803.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/71257086391.pdfIn PDF document text
    • http://soles2walk.cz/data/file/givovigokeve.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085031c8523b---vonigu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e72cf27cfaaaaa59c2970db48169d0e3/rabemewosurisosijovo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f1993b7956d---peweje.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8ba34955---pegekireradipazona.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2e446b31---lokato.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c89ba591---peganefasigirerari.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/75832294084.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/zerim.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kaxenaroxegaxokegupowis.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160881adaa4a16---loxevajulepugemibukisal.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/donagavaxatil.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c147d89d8---42450170355.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/bazabe.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6so0e4e3lsanp2bn2sg9jsg1d7/91334708486.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/78096f9bba347adbcb8240e5d0f3c8a9/49275760077.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sivhh2a3pp999n6lqmfm5f83f7/30221149921.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_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 11364 bytes
SHA-256: 58de52323d8df91adbacbc3308852c5372561241f8bffbe4261be21aa9505f9e
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 20488 bytes
SHA-256: a44fa2c170b058cd513aefdfc1b12733aa7ea8979957d4df9569d533c98b3633

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