Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce0b6f8421b3e58…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 14:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 378cc9804dc7c2c35acbc6fc1ab283bd SHA-1: 687accf166efcd5362cbcc175752df62bcaffe9a SHA-256: 6ce0b6f8421b3e589d8b264e52aeed983f20793f23b10a2d237ae91dd7e9fd29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hotellemaritime.com/hotel/upload/files/ripopekigoposurosefe.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dpbjm6rhirn28k1ghoi7ltjv1a/zevutazofejoroku.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e59447b38f---34991727797.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210818/16292515672478.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/93152031633.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/57377849844.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kekikobemunikenev.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/39176626575.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a03e1343ff64e8b424a81551daf0a308/rutupalozapa.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/66313695247.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/gejamo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca23dbc3af---19041822513.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071630305c68---17181771612.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beb39851133---4600113134.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/88tp2jrg3rkt94fga5ri6i9vb3/11899763384.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd869ede2---kakoloripibekinanemes.pdfIn PDF document text
    • http://airmon.hu/images/files/buserugujazivavuzu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96868281797.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/72922945046.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3a2896b881ed0b4d07d011bb1709de0a/54626380696.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/220433b0a66c6037a54d2865d7c946c6/37934766854.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e35a990fd---97956535879.pdfIn PDF document text
    • http://charivne.info/images/file/sesebawopujufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=social+responsibility+of+business+environment+pdfPDF 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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 17676 bytes
SHA-256: bec515cad64c10c48f23034f890b17ba9bad404f57eeff1741f51b953460331e
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 11276 bytes
SHA-256: 8a69547cb9b724ea751aaaf9205a1e4dcaaa72df11afb9f8aedc3681ed793e36

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