Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd249df2fd6f34dd…

MALICIOUS

PDF

68.5 KB Created: 2021-09-11 07:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2bab7e8a281b7651ed5466c861ec2ce5 SHA-1: 3f096c5a6227f8e2aff15b731dfb51e11b939cd4 SHA-256: dd249df2fd6f34dd03efbc91b1149b4b3e57bd31b9b22c8f92c73ef42c91d895
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=download+photos+from+android+to+pc PDF link annotation
    • http://liavanhaeringen.nl/userfiles/files/biwepugakuregexudakeraz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135238958ed8---84124698583.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/bunepapabomutojovi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161321a907c4da---5615174093.pdfIn PDF document text
    • https://promise-land.com/upload/file/kipiwiretatig.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/vezat.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/tavipuwo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uequg2rups8l9u4v8j7dicrob0/vugupekerodibe.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/binunijezuredavadexixe.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1dda35ef4c318808ae715db299224f8d/gozukorubepapev.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/jujotenupibaloderobes.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/zukemaxowato.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/kupadofijemeruniromubo.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/fulatebevewumas.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dapilegefosa.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/lijukilokiduj.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/betedel.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/25537200468.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138469309292---bipasalenawometebasinura.pdfIn PDF document text
    • https://norservis.cz/files/files/25832984058.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/12167259808.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tawazun.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/5489346348.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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 14564 bytes
SHA-256: 977ab2a96fbf06f4f93d961171c3266fc9e4ee7e2255e32182c2449cfc6bfe28
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10840 bytes
SHA-256: ad7c1fd140d01a503336015a03480b011c44e107437fe4442217df31b616e72d

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