Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdeecdc739e06f2…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 05:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f63617499f6eac16a534a67f6f4352ce SHA-1: 9cf8c12ffd7a313a58c2d56dafd28f9f9fd96687 SHA-256: ccdeecdc739e06f2fc6951415b5018f0c2704870e2c37065f70895a05b9937aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites used for hosting malicious files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=autocad+3d+commands+with+examples+pdf PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc760413a95---bipejufopuge.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6fd1632b---jiletuxefifukifabal.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096795ce98b4---93369011242.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6c14eebc76bab9fdb516ee47472accbf/tufeniluzuzuruv.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/a21rkl9s0tbppl69smqa4ob3jc/98496075688.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c6638351---sezajinalukifave.pdfIn PDF document text
    • http://allasclub.com/campannas/file/mibovapipodug.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0e9e385c0e6925f6c701a313fe14e156/64352145351.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e5a8c1dee5cca81f4463e28f9d89d943/89968288020.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/83027075412.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/60737943614.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b399695d452---sarosopekafogof.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/13897377277.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e71273050e168a01b27c52e1917b8f56/nuwufupenok.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4a0f7fdc9616814a7ad9122ee5738145/84637782499.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0a673892c4577eee9d0f4f6aa11db81a/daropotamizurakazejata.pdfIn PDF document text
    • https://digireg.org/upload/varakubinasa.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160817149a6f23---muxaj.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ee780317061b563a49d280c4bbf0ced5/3688373902.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/aa13ce6c00cb1e47362182a9fb0f56c0/gepuvodov.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kmvsoqtgpah7i4bjf2jc5f8fi6/bamiwivejiguriberibiluza.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/xerokilaxadora.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25fa20f20---13319434084.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6c4f0fd2d488527cad12db85916106cf/20647082468.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_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 11224 bytes
SHA-256: 9fbf91f724f51250448d1881456b9e1d8673450d981432363ee1f994f227e65c
font_02_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 17364 bytes
SHA-256: 783388c32761a112ef24e3f6406eb122dd1d3cba966ae34fd93f4725a184f62f

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