Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5755e6b6a6b9a8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-24 04:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49fad394a86676a331a2c700b1c0d313 SHA-1: 78ba921410ff2c74893ade76d23ea3a864e3ab95 SHA-256: ff5755e6b6a6b9a8ad138cb609100562a97d6ba9af0c9745998869bd054756c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, characteristic of a link farm used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

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 https://allytemp.ru/uplcv?utm_term=cual+es+el+mejor+widget+de+clima+para+android PDF link annotation
    • http://carbontuning.ru/file/71391915382.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/lagokunu.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kuxoxemapajaxakukevozo.pdfIn PDF document text
    • https://duvanco.be/docs/files/naberatajetir.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/17879620656.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2aa692457---49490528158.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/10d6581b9fb241817ddb8eab1a82ba90/joruxir.pdfIn PDF document text
    • https://subarini.ro/mm/file/22682129766.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/refuni.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/86212064146.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/9573187170.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/87208771006.pdfIn PDF document text
    • https://dintek.eu/uploads/file/tatubadixurasi.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42833308100.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e2cdd01d5e65eb51283bf3470bd3592/jezekugenud.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/96813779338.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/43724371687.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/46967656744.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/72427443202.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/vogopujizebewarud.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/kuzebek.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_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 11204 bytes
SHA-256: df6fc1b532e2d796c5257c588ba998f1bef19422f22cf95d2eb6a24e06baa05b
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 18492 bytes
SHA-256: cb82b4f32a8ed5a789329a4aa40543aac4a178a2f6b7e6538d2ed4dc6bc74ab5