Malicious PDF — malware analysis report

Static analysis result for SHA-256 6debc7b02a528088…

MALICIOUS

PDF

86.5 KB Created: 2021-08-07 03:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ec965b64982faacf62c2cecfe58e5e6 SHA-1: b30ec255eb210179f6b0cbd51612eab9ddc84c65 SHA-256: 6debc7b02a52808842b7ca82f2f9c04c5c9c13a4c6aaf3077a23165cc62a7d5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yoron.net/up/files/22558047508.pdf In PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/burenov.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetisujiloravumoz.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210630130253_gxmeir.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/63830447247.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/36289446202.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/oeglkdkon48qg0namrj61j57ie/1986627987.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0db2ad50---59955227813.pdfIn PDF document text
    • http://househouse.it/userfiles/files/61705987283.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfb0eb448d---5714740851.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/godamonujupurewor.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/65022086240.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5da390f07---21519905073.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/14a7c80ed1b483a48e9695d43f9de04a/vozadedixamux.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb18a21bb---40990200869.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210726021020.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/46664015483.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082d07cb8bc5---zumorudedasax.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zogewinewifon.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/gatanawimetix.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/51177175806.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607954a0d921f---49666012291.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/74bba7ab483a2f10ed5a778b41d17bb6/disowifexugafexoj.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607876ee81273---861112068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+active+and+passive+verbsPDF 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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 16884 bytes
SHA-256: 3e6586cae692fdce360c81f1eeac8436b88e1bf6a4dde7d4aaeb09dfac493fcc
font_02_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 10644 bytes
SHA-256: 867c65b760c2094e1682fca29a17483937c2c158b828b79270012300f52e28b2

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