Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bbd84cfabcd25e…

MALICIOUS

PDF

89.3 KB Created: 2021-07-21 02:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b73f5b394f8ce9a49e1f5872f1938772 SHA-1: dd5dabeda79df1a18b61c603aceb08198605c40c SHA-256: 34bbd84cfabcd25e165f5faca53d1358d6ae8274e1e3661db62bc8a24fcf0f93
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these redirects. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://majorsagilekvaros.hu/uploads/file/dasaxajanibusa.pdf In PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vig76b12n69r4enqa4972t93l5/48737871030.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fnghfcj1m777kevhci3kpoht50/19167925524.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xaluwugufux.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106040344216133.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/797de1eaa34eacf082c4a407d2fd4e84/gofemowizum.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/36024018063.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/8211ae74f1932fd805458f1284f78fc5/megetoxibiwilapobiwugaju.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee47da4dea---fasawijurisaru.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75452dba0---93479049350.pdfIn PDF document text
    • http://www.siposferenc.hu/html/25873017889.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/xukug.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210509194735189.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2e9edf22---56211200390.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/ad87e554e19d203a9b0dcc24f088db31/giwawolomidipalokibigefo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c23842ce---fobelubatizuwewubedaf.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788c419e97b---mijowituwuvekiz.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zekonemedisudowu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/15854060056.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2b301b572932cb6a0231a27963cb715d/tipulegidelebuwixali.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2mspqspl890k6ngkdhqfrkrqde/42042626724.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/wowaruwev.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/vedasagenizezotilifipek.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/zinizufakeke.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e210badc0ae---83728354992.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/9986320117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=is+steamed+rice+good+for+youPDF 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_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16988 bytes
SHA-256: 4da70d2ed7e46b3d0035eb373735b96853235304bcad3e56930746d12a82019b
font_01_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 10832 bytes
SHA-256: a83992a5e503c4d6c6501ef64a2489529c6977472ac8ce2f2d26ddec1f88c70d
font_02_sfnt_off00013fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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