Malicious PDF — malware analysis report

Static analysis result for SHA-256 5092d64adbbb5e40…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 13:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8223b5b4ae199ba88fac798f60e6d311 SHA-1: 3313a45ca79faacc1b9175469c1b13e3c6d83757 SHA-256: 5092d64adbbb5e40c040267a50a7a20e2a9d5256eb34a3ccec9b5e447e076f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and link farm nature indicate a likely intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843e4882588---73259268829.pdf In PDF document text
    • http://zsdbiopharm.com/upload/files/55874501894.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16105482732064---zonunififarexojagapixeju.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/87156842954.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a190de15597---sifikagejifudomobutufewen.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/23106957073.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8eb408980d1afe81c836870cb3343c90/bikefipazokixutekop.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/mipuwadaro.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/52729170690.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc3678e86---nemurifurolanevitoz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f1d01731---fimesanonoputukolus.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/lulosulowosalutijogu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8dcbd88be---nikuzokawibanubumijarax.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1807eb8f---6963114620.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/15398217703.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/belesibifewikonisepoz.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/jemojafubemojejubu.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/6409183573.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/99603678295.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/11f01e3f2031762767c47e142382a971/40730785125.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/21426202119.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/42611555738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=descriptive+research+pdf+2018PDF 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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 11016 bytes
SHA-256: ddf49fc11a76440c51cb4cc03f29c5a0559fd923a9959f966aeabe37c1c2e86f
font_01_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 18060 bytes
SHA-256: e77ab2b89392a562a34b3c30c088268cef5334f385cbfebd363cd68ba48cf7b6

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