Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb104cc70aecc91d…

MALICIOUS

PDF

79.9 KB Created: 2021-08-21 19:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ec9b60f99af60b1d09dd36b06d0aebc9 SHA-1: d339ba68551949c2cc592615b08f45ac908b5a56 SHA-256: cb104cc70aecc91d14f076a45def9a0fa40987f200e630b2132a9ffa001fc7a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure and numerous external links suggest it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f70b206a6---24079006812.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8b6b6664bc3a3ed971f5ad3693347162/45336887638.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/dofixo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b37da6b7a8b---44967320661.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/zojubefalokukavirijeve.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c1lrrdhmjrl61p0giuak6iohq/dugipefot.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/48889082444.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/8654803713.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d4a82cd83cca860645c2253491112542/nikevazenisexoxov.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/35776526415.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/7grhjosteua40rs73krh4r7q41/lozadavuraku.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dca80739---32594887714.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/simexinizigaxunas.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/koponomituzifed.pdfIn PDF document text
    • https://onlinendttraining.net/files/paduvuwupabivopixuniw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd77f2777---vupizurewenativef.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/woredojokinorojejiji.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae7216c707---60486299474.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/40571762448.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/63092531776.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kadolifoberuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+cheat+superstar+smtownPDF 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_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 10680 bytes
SHA-256: cece2eb0469d3cb954fd3ae05f615f4b126df95237239de34e86a3e21dca672c
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 17052 bytes
SHA-256: 11b32bc3d8492c9d8d063b55b01d7212dd7ecf17bc160da831ef732efdf8e182
font_02_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.