Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cfd70bf8ddce89…

MALICIOUS

PDF

87.3 KB Created: 2021-08-14 07:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cc48a74c6ddc68e9ec99b4a6cb0f50e SHA-1: f02c6c4010ff4ff06d1c5e189d50580ffd97e004 SHA-256: 88cfd70bf8ddce89927428747dae31c8ee70dc0533fc3f7f82919d3a3d4f366a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest the PDF is designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=applied+statistics+for+business+and+economics+pdf PDF link annotation
    • http://ytbozhuo.com/upload/file/180330264075.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608348bde3610---zuwanujado.pdfIn PDF document text
    • http://yjccnc.com/upload/files/wukozamozomafugap.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160973adb69e16---refikugolalas.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/19872274818.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073695f6b30c---36323947709.pdfIn PDF document text
    • http://jonme.net/ckupload/files/biluwagilasikemusu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/edf476e57fd656bc8428e9b1a267e4f5/27700916221.pdfIn PDF document text
    • http://amdind.com/userfiles/file/74354633228.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/57053406807.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/56e94c35d669bd79dd8ea56c1241c16f/49157429498.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pe24tnfbcj3hd5jd7kv98j29u6/84678977589.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/gtv02hj1mq24m3usiavn8sdmmp/bozapelebalasix.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210813212034.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/38829712661.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gufalesemuliro.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5816b81df7990875d9915a9eab01267f/17562290892.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f5bb7e818705887ec9fcb818b4b10c12/xapotiwasepujob.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/55f12bb3c8e9da815494a3677e82ea41/24955314555.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/ketutaki.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mokofamugovipemumitov.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/lesujeb.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/81118381294.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/sofamekizozuvo.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_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 11000 bytes
SHA-256: ca71f0a8622c4bc2b0de482f436342d6fcbb38df2837e53d521f19cdc16f88e6
font_01_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 16812 bytes
SHA-256: 3767b1238a11138ef89451177b524a50125b286bde71a2cd151364a244d3248c

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