Malicious PDF — malware analysis report

Static analysis result for SHA-256 8221bc5d6d3948b1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 09:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d2741a21aa2610ac002b7de7ecad5ff SHA-1: 56bd63b7c5a48c0ad24d5dd880a888669a02ac30 SHA-256: 8221bc5d6d3948b115afbb6a4898aa8dfb23197866053e2112b92cd6dfb3fe20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=change+your+mindset+book+pdf PDF link annotation
    • https://wisestudentz.com/userfiles/file/padiduzedupelezizo.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/molad.pdfIn PDF document text
    • https://businesslife.com/content/file/gegufisojovoluzinut.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/sovigupizirosu.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/80673258456.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/kares.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/zutaxarejekafetilufotagix.pdfIn PDF document text
    • https://derfo.info/resimler/files/jagiwipigivajipun.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fcfae89fa1065e6a0019c180033d3a58/28954353379.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/palurezelovaxutasoxupej.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/78763444170.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/34544462725.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/432484739.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/51168903113.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/zepuxiniduzubaluxomuj.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/weduda.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kojasubeveziwupinepi.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/dotaparajiso.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2a24a970d1aca0d4f8ae649c1eb91031/79511079891.pdfIn PDF document text
    • https://kermanrooz.com/img/files/12459478620.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24240926226.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a651b52cf---sokufipuwi.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/mopexuwovijilusa.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wugevo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/48651073234.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/jetozovusoxobofel.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/vowex.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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 17860 bytes
SHA-256: 5ad6d198f14c96e7c2aa6cc4d396448a7d5be5688722040833f57f69de7a246f
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 11376 bytes
SHA-256: 4404dff3d2b231ed61637c06eef1f118a708f965f352b67b0c76a01daec6a618
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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