Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6d4ea8d066aeba…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 09:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f723a8995f163ec27fbb04df99cdeea SHA-1: f401f50d7f26d0c0d1b5769bc8a8dd511f79ba86 SHA-256: 8d6d4ea8d066aebac1bd598f06d27ab252f9cafa4e1569939f215223e9ceff3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. Although no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525852fad6---26528648102.pdf In PDF document text
    • http://studioferrato.it/userfiles/files/47026253270.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/53651904176.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/nebiliwu.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/83815050970.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j70fehu50g1ihf4hgeb72fkg70/87300625568.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/debofoduxovidovozijiveser.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/xefixifejezirulunejasunop.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xutonijoxikiforiwuxikedot.pdfIn PDF document text
    • http://phongbepfagor.com/userfiles/file/9753071033.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/1408251502.pdfIn PDF document text
    • https://mkontakt.com/dat/file/xovani.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/zixexuzedamama.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/kapez.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/nexaterediriva.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/pudukeb.pdfIn PDF document text
    • https://verner.lt/images/files/89729407682.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/nowaloboraxunigib.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/lixipusakamoxami.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/72021819064.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/71361118424.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/fejozaxexudixete.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681a94d9f1---nuroma.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/11322877776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+the+different+data+shown+in+the+graphPDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 10808 bytes
SHA-256: 0209c49635710cf7e4ffab3249c0dcea0711772e97e0b5a303f99386f36f1bbc
font_01_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 16884 bytes
SHA-256: 8051f155c0019562056921a7c83179d0393fd8f20fd0c35d35faefc48dfebd98
font_02_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1