Malicious PDF — malware analysis report

Static analysis result for SHA-256 c055465cb2a0e866…

MALICIOUS

PDF

107.2 KB Created: 2021-07-23 23:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c168831671557d052cd96882ff6ed17d SHA-1: 53105c7a810091b9362e196c9bbfed71339db9e6 SHA-256: c055465cb2a0e866f98b92500bca42752f9aa16f154c1527fdf7c01332ae8c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. It functions as a link farm, containing numerous links to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The primary goal appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bp8ljc3hteas58k2abvmo907u2/53493213256.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sibegomipupuj.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/67859060153.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/90897436818.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5d70b428680b8063381b25ee4fdd4246/36462788732.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/85306153958.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/52594864998.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/f2boirbkhg3occ4q6q29ojiop5/piperopez.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea34aace1---lunifofimivipig.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070052841ca9---52703731171.pdfIn PDF document text
    • https://masihpt2.com/contents//files/zimegilololezebemiwofojew.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0e365c795c58cc1c540f119ec35b8553/zekofopetenukalejopubu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881e90f08e5---budoluxa.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/2605336862.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609979cf68b5c---35038157254.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/1985424163.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/47595228866.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/mipetevoxobibu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/tolopesaso.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c514caa4993c13694a83eefd109f156d/33422672153.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/sitibiwofelunit.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac192cee9b9---dinijab.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b93e88ecf1d3adea1fe2ba7692db2d81/gasafiwetadazoruvul.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/55981734701.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815e7f7ca5b---lamivuwaxoduzifu.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/97969339908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=articulos+de+anestesicos+locales+en+odontologia+pdfPDF 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_off00013a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9A 10876 bytes
SHA-256: f1dfa452dd9cef42df7a657d84da4b74095d5c4b08abef5361fa4493d39daf4d
font_01_sfnt_off000153ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBD 18736 bytes
SHA-256: 04472c2497bb6e8a7a61583f7ca16c84f2cee023441e5bb02427ccc3ef046921

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