Malicious PDF — malware analysis report

Static analysis result for SHA-256 918c41032450fec8…

MALICIOUS

PDF

108.4 KB Created: 2021-09-03 23:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e6295c7584fa872f2aa58cab9c768ec SHA-1: 50aaf439455260532a450a01a5cd8452d7ec7297 SHA-256: 918c41032450fec81bb1845d61c3338279d0f8599999bdab42fc6dfe8a3f9671
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest it's intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://2018.letnifestiwal.pl/ckfinder/userfiles/files/kewiviz.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108852b66b7f---tosebixazoraxu.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/50743011369.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/vebisiwigidesenixizidigix.pdf
    • http://domesticsolutionsagency.com/userfiles/file/82016083761.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609de26605207---52911048661.pdf
    • https://yukkumpulgroup2.com/contents//files/rorutamuk.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b472bc6dfc0---27201020432.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/26cdc97fbd4390a5ca6e38d24a4d9eb3/tazidanesiv.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080b412b19c2---87097993746.pdf
    • https://kermoulin.com/userfiles/file/tinovesudo.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/visfu9jhddn466upn629k2hbik/84369852736.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc4357e31---18517249599.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/bafesa.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/22217832269.pdf
    • http://ttccid.com/userfiles/file/ponopuporaka.pdf
    • http://bsbcarpet.com/userfiles/file/79492259589.pdf
    • http://championshipsportsrings.com/clients/23492/File/17939130655.pdf
    • https://lacecinella.com/writable/public/userfiles/file/78422370923.pdf
    • http://parmalab.it/userfiles/files/kedixetijef.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/85ee19b30b13caa5ac13e0920e83e968/jidixezofoxujuzuferozuz.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/polerekelesugo.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c40df0df---vudafiporevufajet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=continuous+integration+with+docker+and+jenkins+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_off00013cc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 16792 bytes
font_01_sfnt_off000154e0.bin
1fcaf3b41822fc1852e8955bec3d4a69ff3bac0d27bff78bfbba157b058c9296
pdf-font-stream PDF embedded font (sfnt) at offset 0x154E0 11292 bytes
font_02_sfnt_off00016f3f.bin
65e335aa6ef953e590c2c56ce61a7f4905e6cda400306cc79736f5ad733da5bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3F 20248 bytes