Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc639bdd7e37c4f7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 01:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0427e6c851cd19cdb89640010f52fc6f SHA-1: af0275b6c828937d33435ac283bd4b35bbfa0294 SHA-256: dc639bdd7e37c4f7c8f0caa21d915c97bf25a97d9d9f916b12fcd7d012b51b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using malicious documents to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chi-kara.net/userfiles/file/nijufulus.pdf In PDF document text
    • http://ansonseatery.com/uploads/files/36378209635.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vesojodugufokan.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/23de3c12a646df6b28f53702aae4d55d/gozenobosegowefete.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/kobufileviwafelomatoli.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e8779ab91c0---47240480497.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/japavefabekulefenagolerop.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9d796c19---17221569701.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba5c01a6a---93616126249.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/43868599139.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc11b9d3f---wanod.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd5fcbd97---gejobaravujijoxeju.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-1/20210601013035674053.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611a55d0d0cb3---6227717858.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33015174873.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/47448416438.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xinoxuvepul.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/55643787029.pdfIn PDF document text
    • http://abwrva.com/uploads/files/betovoxopimefeziwunovuxa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/17ab782b512151f75a708380ec87fe40/65230959214.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ac594ce2---pakuxejomalu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/27163c759d660b07f26e9453d5e05074/juwonanep.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/32448343277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=today%27s+free+spins+coin+masterPDF 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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 17936 bytes
SHA-256: 57fce8a3938967835e16a036348c87781ab7d18913e51f01903f62eaecb058a2
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 10848 bytes
SHA-256: 7b1cb8906079221e2ad8a47b5f5ce69f503be933fc7a4a963bf82df1839af544

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