Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb585d756389e8ca…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 09:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 632d8ad9d73472a2a8830038399a7203 SHA-1: 1852925623478ea45cfbaaf2e348cb003c877a77 SHA-256: eb585d756389e8cabae11859606098258f1e3622f51fa57b7f9587158b5c98dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable infrastructure, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=a+concise+introduction+to+logic+7th+edition+answer+key+pdf PDF link annotation
    • http://asv-solnice.cz/_files/file/54956942013.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/87378525951.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16205923334428.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/tixokesuguni.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/nabezomamogusenikiwovavum.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b59d3631e---88689896951.pdfIn PDF document text
    • https://airshow-bg.com/file/sawotibaziwobemofaka.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae1814570---92483786757.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789cbbb0c74---dufitijusavojolibuba.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3f9cac5d0240a3abbb7767ed0011cfea/nusemobivijigonosabonol.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/kepaw.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/lepagudunetapusikomajire.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510183535812574.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/3145244319.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/deziwiwetufumabewirixum.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9dc551ec1c54fd6afee5b96c9bd6c88/rugivuwusinevexi.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/71048858968.pdfIn PDF document text
    • http://dakmet.pl/upload/tokolu.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/18116460256.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gedisetolikaro.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/81qrash4s4pqldq4dap53vtsa2/51776661273.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160747a62815f3---zodikawifer.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 11320 bytes
SHA-256: 8093dc4335a4de832b0a73f59f608f20a700440c9ce4740bc86cde2c40f75879
font_01_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 17232 bytes
SHA-256: 3f9ea1656202e44616b81b5a81172497201ff0aaefdf7c17d0d68cc0daedaf01

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