Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecc3b26b746fcd9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 05:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c8f3862d16255950383696d715a6466 SHA-1: 1bdbc86badd8abd0da9fd9ad8868726df11a1d25 SHA-256: fecc3b26b746fcd9b48b736fb6817e561c8fb9ec96bd7803935a23832359fb96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a campaign to leverage search engine optimization for malicious redirection. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=creating+pivot+table+in+excel+pdf PDF link annotation
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/gumidujopesazode.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/26201277235.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/abfae0151f741d0a9dff10c3a93bf77e/jugenotefugewujobepunu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f848fd831117ded569073dd8461c6252/babikegejo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8495530e41d8c5794faa666c1dc59343/65679555186.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/77394385657.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/52839308723.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rosexewixifosukaduwa.pdfIn PDF document text
    • http://dhf-china.com/d/files/17606731125.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e1ee455d5332b3930e364f3c664eebe9/14016403618.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/17784358484.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zamewebelawoxexewufibuxaf.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e40cac603bb08ba83eb01231e4ecbe61/wozajedis.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ek8u8tlsasdufqko18dd6i3u6i/zibijulozoladuranumopetu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/786bg6t77coro63ah8uc7glsob/pekebozug.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/o6v0bv7eslqjmqrl1foo6fm0td/nukosenoku.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce1822733---39227269835.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/68725266881.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/67b50c571c7b0597269946eaa844204e/87327835748.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d81c55b0080.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/7dd9de1af03d067d60b32d3d12d684be/30749435339.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a577cc0b40---48488858951.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/25639545219.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a5e2caaf---bijifurinas.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 18048 bytes
SHA-256: 41e69fc4c72d37cb604c56e00f9a6463e7d1fb1c75e43b1bae40e95797a65711
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 10964 bytes
SHA-256: 7b7ad8c1b8db6994e756aed108c309fb0cf5dc72f733f2dc7b4251a06a4e3af7

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