Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdf4249af8eb7eb…

MALICIOUS

PDF

119.7 KB Created: 2021-07-05 20:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b80110d4dcf02d811847944cde04e582 SHA-1: 1d4690e7033b9082abedb08c93866f9481d9ece6 SHA-256: 9bdf4249af8eb7eba6f8752cadef611ee943383455ab55304cb487518a2a41e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://w3-japan.com/js/upload/files/gepanov.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ef30vgndi8djbj7mj3pl6sfi68/dolazesulo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d13837ea7---nufolosewunemud.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd298c5629a---mivijitavunutisonuxu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd1508094---77319298569.pdfIn PDF document text
    • https://lasanisports.com/files/guxotot.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a715e1b789---32327642617.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/90597586676.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/4932290879.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07742a06ab---38321400881.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ad2b6681f6403b2721aa66786e8eb1fd/62015892746.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/28792149591.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00404ee99.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/19845084897.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/puzobefajarozewuxibovizu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bvi8v7uapkrbg8gucau4gh1lo1/dopixa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160821288ebbfb---8530769788.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137ba34e3f---37222465334.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607055f0dca27---toxevu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a74df1e6d03---82453448024.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ef4425b21ec906d51b97486ce31a632d/21272755575.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/fozakososajikonalejaliwim.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/bakuzipuwoxibunipololedab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=why+the+hell+are+you+here+teacher+episodesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 25400 bytes
SHA-256: 711fba81683202c4ee99f21c0a133721e9f26e6d1170ae5d74ee38a93c7c7f33
font_01_sfnt_off00015b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B23 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_02_sfnt_off00017106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17106 10712 bytes
SHA-256: 27207d7491d2263bad1af6ba294d01930e4abd428fd185a284652eb978ca53fe
font_03_sfnt_off000189c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C9 17800 bytes
SHA-256: 69af1ab57c22ad62198b117b8bf3787c58b122c7739deeb9335686ac16e9fed8
font_04_sfnt_off0001b85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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