Malicious PDF — malware analysis report

Static analysis result for SHA-256 39deed9faf6fc053…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 05:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7701148cde07de2ee21e47970090772e SHA-1: 26a654c9aaa9f76524d6d395d0fd077c0c0e7b81 SHA-256: 39deed9faf6fc053c9638bb3d88680dc7f2be3ec2437ca1ff9e5d4f555bc3558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The file is identified as a link farm, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nanoscopy.ru/uploads/files/41693838073.pdf In PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/rusaxudisisigelunukisub.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d00a7db17fe---nuxesukinefola.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/vrk5jtmgcf4d4rd0p4nje8vng9/8124096319.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3fbf123dc---44665988315.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/rededumaxenarali.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/4cfe6d6841e0b18f01066ada0a8b9b1d/vozelejegipozemiluzav.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6637253e7---suzakovawu.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/nutopiwi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bbfe9cef63ed3f1202c82ee135851773/wibezadukela.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021063014581073499.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/zorasisa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b312f2c91---75168056680.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69b9936f67---82019241929.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/80541897590.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/rubiju.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e483e6096c377576ac2dbc06b505c8b3/fisojopikakoto.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/958f4d8e0408edca9303febeeb28a839/negapojupizififodapezi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/s84r2iiu1sf54cllhetvteiijr/xunomigaruv.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/xedofebagikolalegix.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/4812033879.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/rurijubuguxi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fb34b9a130714589130124fc4c312d5f/25181366826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bsc+agriculture+3rd+semester+notesPDF 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_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 19956 bytes
SHA-256: 2949091cd0b23c740b5674fe31f03c692273b8530093df5ebd5e1d68dbeafa73
font_01_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 11040 bytes
SHA-256: 8797abc9145f705353eaa3bb0be8c7259af8c8b1cb1de8394a3b0c29d811ed76
font_02_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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