Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2735ad2e034dda1…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 11:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f60a456fadca70b355be2f4e6dd17c9d SHA-1: ff813e2f550bae81f141b0dae10efd56b3a60292 SHA-256: b2735ad2e034dda19665900aa8fb21e6bbc89d4ee8d2d0197e8a2a96549c8506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/509ec49bf0d91c952318f90ad61f4dfc/96647562362.pdf In PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/bolugowijojozokuxa.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/kuluvefajinujaw.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/nonurukedapemesi.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/katazikizizodevudavu.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/71595669384.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb197cba47---fivezobawujume.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/51194130404.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/vopudodumuga.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161030dbc2d395---70729127641.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/i7t9v1qa9h712117q53fk6btml/xukuxitakadajisejuv.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a149836cc8170b2fcfcd2e4c9f6c02a7/69682530626.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6e94125e3---bavofitozigopikurejevikum.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/jiwimorowojatowa.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/71c9e47fc38ee9470762fb48d4f6b390/kiloranuveduv.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/65213536976.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/91072966737.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/mefebedorekakififekol.pdfIn PDF document text
    • https://pmms-online.com/assets/file/totubilopa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4c9b18076b915f82c3e284e21bdb8baf/jutojivevebimij.pdfIn PDF document text
    • http://landpas.pl/upload/file/84556145967.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b1749e4dd1a9ae93ea651afa1e507d3c/fugogixa.pdfIn PDF document text
    • http://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/nuxezolabedusufuxazolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jbl+earphones+manualPDF 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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 23252 bytes
SHA-256: d4e921ab574c487ff2343673d591e143390f21eba01a3fdbc8df6bb09d6c8bdb
font_01_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 10556 bytes
SHA-256: 850526f56cb5599ca6bd8c78a14056c98dc52d7d65c7b8fe8031b02593d0d10b
font_02_sfnt_off00013149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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