Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a351d59cbe2279…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 17:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe9050fd6d0ecccf4975dc427d6b993b SHA-1: 374c3ad81c6a5e032d0181f734e7c35f1a54a6fa SHA-256: a6a351d59cbe2279dfbbb49174ff20c0e9bf1cdf7de72f14a9ca14bbed856052
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm intended to manipulate search results or direct users to malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://moraure.net/js/ckfinder/userfiles/files/pipigizizen.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb27a45359---nozupimewupape.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zozilu.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/mevosafapawiza.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16137b522e5f48---61025157989.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/prva1glr2ftt7jsb7850dhicu5/42291546125.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/72124957374.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/180506731.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lopixesukawekipumuvezizi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ae926d184a2c32f458bd073e764dc7bd/xilafesi.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/guzowuximav.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf20a9165---gefekisitobiwapasefejo.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/vevabezokomusidologenaw.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/76688143204.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/77228587609.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/pamuritipatomivokibavig.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/lelapilowemirutov.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/iq5av4a2ur73703hu87qs4jpm6/9110791611.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/28994835643.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/84226314572.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130c36c56dfc---48796067220.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/45850303340.pdfIn PDF document text
    • https://krossi.ru/images/content/files/18303342760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wii+roms+androidPDF 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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 10124 bytes
SHA-256: 79d261f9342fd31cf481c91bf8c7d4cc230597e7d341b769aec4de226371d9cf
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 17280 bytes
SHA-256: a5d40092177f0e7d44269953bf020da7dd8a5b50d79967b4856b052a0208db8b

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