Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0619adfff0f32f…

MALICIOUS

PDF

85.6 KB Created: 2021-08-04 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1c677238fc665470d0d15122fb55547 SHA-1: 13345d12faef0dfc93b080d6b80103e184769570 SHA-256: 8a0619adfff0f32fed67091b3041c719d2f1bfa8c22e5457875ffd797bfa7bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://fittbike.hu/files/file/54360420658.pdf In PDF document text
    • http://progfin.pl/userfiles/file/zibedokikedukivikizo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/davekadazotigaripid.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6577b90cac---suzinirazejut.pdfIn PDF document text
    • http://stattus.com/assets/file/xapinowepamajuw.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/84678a7c95cb5f0f2ebb9baddff2afb3/makexipewazijoxot.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9f487be4---77303762711.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9143e44e---joserebu.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/4814566039.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/52105863139.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/320i2nc105vmtef65o3enqbaeq/51757482363.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/20628507628.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xalaf.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/jifiw.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/zejemebulemewezelufewi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/gaxusazinuke.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f80d6e5a2---85841258248.pdfIn PDF document text
    • http://policylic.com/uploads/files/40340624587.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c4e57a11---minagagemobevem.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/10lvrr4g2j1ho8sknp3eohnlb6/23282018040.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2pre689lq3nvmoloe0ve31h48c/4985272514.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9a5bc38a---164100671.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-27/20210527045703490231.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/zuratifiso.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/23548505567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=can+you+play+mario+sunshine+on+switch+litePDF 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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 17140 bytes
SHA-256: 5b3a48c28fcc53aaea711c43e6f764ac508817fed3a7a27fd4b6c4eb12564c90
font_01_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 10968 bytes
SHA-256: ce9ed9520b1f7d66c7fa7ec25bfa9f9482e1eb564844debfd9583960a9ca1a35
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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