Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dcfb5ddbde8f0d…

MALICIOUS

PDF

85.6 KB Created: 2021-07-31 13:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 930b90c3dcfaa0019836727f1d79ef88 SHA-1: 46f3b87543df4c78d5fe51b5fcf4fe7af73408c9 SHA-256: 10dcfb5ddbde8f0d2f0e98bcc73811f86d3704ee5c8b77f739373c1bed187e32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://chcial.ru/uplcv?utm_term=plant+and+animal+cell+coloring+page+tammy+morehouse PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a60ca7145---dupijujavowosijib.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/34919348671.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430213007145.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b482c72fd5c---3656056521.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/wedatuxonedoj.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/fibatajug.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/84563915259.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c8a47bbe8---61237737472.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/69672815971.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/suduwawopi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514093356_1290218466.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098375915632---jivan.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6f392764---13664297189.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0vrm965174p65ks003aou0euf2/77719553265.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m9cdnkkmseo78fl9q1fm79n0ja/nevofiteziwivubi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bcbe19c27f5f15c46ae753aa22dc68b9/9565999440.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/69432529270.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a1d57e63---fofuzire.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/68935154250.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c67616a50---majaw.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959e4dd5c40---46761806028.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/44048789395.pdfIn PDF document text
    • 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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 17524 bytes
SHA-256: a3d14aaf6eb0b6b65eb0aff20a5f7cb3329ab9a996646df549d6157edf6a3d9c
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 11176 bytes
SHA-256: 94be2966583a29e21af45cabb00c07cfe91485549262d1ef481f9d1d377ec992
font_02_sfnt_off00012ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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