Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c86485bbc28e97d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-05 09:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9f79bff8673240f64ae36bddef18f5d SHA-1: 1384c1c5055ced378b8b9d169467659caa822531 SHA-256: 6c86485bbc28e97d82cb662d6debd71761652a4a20c7243017d10e85f1baaad8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, specifically within form upload plugin directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload storage suggests an attempt to leverage these sites for hosting malicious content or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1c478819---rudezigaxirokumulun.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9b026c93---3656077099.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5c3b17d5---25079024067.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fjopjfc0rd10kq96eb34bmlsu6/81868025218.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/53401610565.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c37d45529f3ecd7e203eecc7e744e386/ropepojosapo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/69369751818.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160951f157d303---zomirufawazirenomiru.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802f3f68460---92447629541.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/lisajeriza.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788ec88f6f6---91713690532.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dipuduleji.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/wibonamupikelusolugixuwa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fd98512f---talakixuwidawis.pdfIn PDF document text
    • http://mutitar.com/user_img/files/feliditavepamopide.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f0be3095---35713320958.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/9161890003.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb97fa8b253e4cb2f37fb2b260f8a8ba/68888243958.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5eabf4352643228371d21a1a1733b06e/16269660664.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c75297cf8ecca64236d6a5b38071bcce/93022104913.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/as775f97tqkpk5i39cki5v1jug/satisurikudategusamewidop.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/85692071238.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52dd71b1de---49489733929.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce24ea41852b26ad8225b739ea4b19f0/34813065113.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4ebd89fa65aadb555a6abcd3c2c81607/65210310089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+promise+of+the+holy+spirit+in+the+old+testamentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 16496 bytes
SHA-256: 5b2b23b4e3bbfcbb7e0cbccac951331e24788b27fe6dfcc26a555cc27c84daa8
font_01_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 10840 bytes
SHA-256: 7c3c0e879be008085c47938c3696d6299828da94c1c3287bfc3e544574c85a89

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