Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5543684076eb14f…

MALICIOUS

PDF

75.0 KB Created: 2021-08-27 22:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 519f1c52772c8cc7f788a09cfa5c2b3c SHA-1: e4ec6a4fd382b37de672489d0702e85fe618ba83 SHA-256: b5543684076eb14f53537b41521037e09b7bba1b6a1c233277da1950c059d1a1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination. The presence of external URI heuristics and link farm detection strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://c-amc.com/upload/files/jinavagobomewaj.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f08a8f816fa082f0c1db783b47ab59a4/bipixu.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/fd0e7f4b30c3c04c8d8ba0e77ebb7f6e/63219649524.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/nawuguvatedas.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/rujixujibav.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a7ae0eca6306ff80e105b503771ebaf1/40879245253.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/sivokalap.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zenejeparekefajadosejeb.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f605ae1e---segipinip.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/59359445473.pdfIn PDF document text
    • https://petala.gr/userfiles/file/2083657186.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210530_221632.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/redoroz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6822522c9c---57237420117.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a9da01be---26037063664.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1bb009971ebef927bd9699a86d827776/gubufasalusoxi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/jalezelimufukuv.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/57248cd48d6b8f0e68f5e8932cea1e7b/rujunuxotudod.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50b25ea37---kezozudipurazinaduvi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd9e7a802---sumexugepefoxeloziladu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7bf919e09ffc5d0718d16f6930065833/sesinewewefix.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/77279929184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+much+do+shoulder+tattoos+costPDF 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_off0000c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 17856 bytes
SHA-256: 35386a4df25b6d78897ea620a1bd1b49dd0065671f197952188882c570c5ddb2
font_02_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10616 bytes
SHA-256: ebfd516af408b7a83254bc90ef313f156479e8f13023223e77fbba1831265ee9

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