Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d4b0dcb91ec62a…

MALICIOUS

PDF

81.7 KB Created: 2021-10-18 06:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9522fc0c6f1c1dfa9500a8b001f7734b SHA-1: 56662ac782b1925e5af9b393ec2472ed8b5ac42c SHA-256: d6d4b0dcb91ec62a5093b821260a9d90baa5daa7961dbda1b494f37be8d5fabd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cpk.by/ckfinder/userfiles/files/zurofogili.pdf In PDF document text
    • https://pvesc.vn/uploaded/file/lebajajitibatodawaguj.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/xutaxutosutowopasib.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614995fb6120d---6530702098.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/72130250608.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/14809652982.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161655f05b3ede---vuxigunaxa.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/92879530724.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/bisakuvumu.pdfIn PDF document text
    • https://buzyhub.com/files/52091270596.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/241351588914.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kuwulovojifozasu.pdfIn PDF document text
    • https://ipmgrouphr.com/uploads/news_file/giseruzikir.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1lr19kabsec2usd61tea0l32as/41085687836.pdfIn PDF document text
    • https://viceda.com/userfiles/file/40310226801.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/kupivogojepikipizofo.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/23304009427.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544b1c18d30---71806042933.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/rilubonexirogukelibexuxe.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/19235889941.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/31474335408.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/89803535246.pdfIn PDF document text
    • http://bibikid.ru/upload/wesizomivepakafifesuni.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/rijumafubiwilil.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=words+that+are+spelled+backwards+that+are+the+samePDF 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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 18040 bytes
SHA-256: 0ffbaf0fb936d24a139deee756738ff028d56ecbb5abef6b0e757c9ca92c1fea
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 10896 bytes
SHA-256: 31d3f7840949b26221d0f078c962ff9d5dcd44d2e75bded454f6c02d6efcaedd

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