Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc371bc63bf18861…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 09:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 096ed49afb8af9d20337a9810c8ac38c SHA-1: 26e3c114118f97d0e83020e4435e96eb1f87bec5 SHA-256: cc371bc63bf18861395c548ca255c5dc0257074b06f3ffc0de71d1834ca12f97
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 are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://youandisagenix.com/ckfinder/userfiles/files/41469454120.pdf In PDF document text
    • https://kristinanamaste.eu/files/64817943265.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/tukanokutivofofiwumiza.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/towefe.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/napebetezopop.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/65807946254.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a005f8527741734202883b2bd0a9d452/jagemajezafi.pdfIn PDF document text
    • https://advik.net/userfiles/file/fasuginer.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd39c526b---latedexujibonenomurivusan.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/63385209292.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/nitaxobitum.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/56856383098.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/siladoz.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/fizapozunepota.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607511e1afcef---45766163311.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/34213447869.pdfIn PDF document text
    • http://bamila.vn/luutru/files/51262883764.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a1b789469---gilimotapugosuxel.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/wekikotedezasuluza.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160729821a5fc6---68201711288.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5b87d782---71858677524.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ab4048ffdb9c7e37dc17c84d6765b2c7/61504364404.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/21148939164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=merge+and+delete+pages+in+pdf+onlinePDF 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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16724 bytes
SHA-256: 8621a5a7319cd181e67c1505c76bba8fb3894d78c45669ff3f44a0fdde68ba8f
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 10668 bytes
SHA-256: 0dd63c5b8944d5b96d99f391854d7de35f6f6748bc8b0492b38b2531667e47c4

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