Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6612fe78de7c47…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 19:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20c6d46c318ff37bafb867432e1eb7d7 SHA-1: cab3f11b162061669fe514267f7bff07c00994eb SHA-256: cf6612fe78de7c474df01cb01d2659984a104178feda1a64ae76a8a0448f58d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to initiate malicious actions. The file also functions as a link farm, directing users to multiple external URLs hosted on compromised CMS upload storage and disposable domains. These URLs likely serve as landing pages for phishing attempts or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=rpg+maker+xp+android PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161384ef6f0e91---donesewevumijuxerik.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/74068088729.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/54201301462.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/67560265132.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161315067e70dc---88478197183.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210908_028316BC16D20614.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/88421032785.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/59335932167.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce967e9eb---64738355984.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/xiganogunabut.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/9065177159.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/vidiwoso.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/55879167234.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/ropiruwexerevakupasadavax.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/tojugonosajopinadafarozul.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/50814885998.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/2026349632.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/39823302434.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/53471358051.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16130f236757ce---begunumano.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569a6a4ad4---43110492117.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/wafuvubizudumelobijav.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/pokipugaditurev.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/5061658059.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109110213204423.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5bf60c443bf5438a2ab0071265ca9f26/sapiriruwuradazikoko.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_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 18248 bytes
SHA-256: 57260756ded143f80e3bb085fb5582c5406e11069df321311777a0b82a86d720
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10660 bytes
SHA-256: ebdf849a07c92c2736ed14a0515d09c00f607d86297fba39704a301ad412539f