Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c621cec240cdb0a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 23:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 018ac54054bfecbb21032cc32d1184b7 SHA-1: d50b3e194f5b7b2093a02625e8429fe3ce444396 SHA-256: 4c621cec240cdb0ad4a2ab1d2949a723714eb0fc0af0bfe2381d5a75ec025b47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=herpes+zoster+signos+y+sintomas+pdf PDF link annotation
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/766040207.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccadac4ad7---77722280706.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/87637781474.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/39965777186.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/dobafujexenudubu.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/76298595978.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf35e248d2---51704684471.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/miroka.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1e24bb60ba5383c659a078f75e0053b6/23397247391.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/803a1cfb4040eea4b5f82f51cfc8f6cb/fabovomuf.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2d0df244d53c203c0e77a45940f5a2fc/ninaxufunimotuxagotav.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202108210607213856.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609230b4dc86f---79386266427.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1d6e8ac90c7fa962e92b808a99621ad2/16668890509.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o307nf5iatdvfio96dgjl3sii6/72183404624.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e72e78c19---44100686481.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65652314708.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/fokevelabe.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210623183757.pdfIn PDF document text
    • https://pr-dienst.ch/file/nupumupagig.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/kubon.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/90625332020.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507083709473431.pdfIn PDF document text
    • 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_off0000bfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 17080 bytes
SHA-256: 5d4c2880e023b2ce8dddd9f7d108be0970c7f3e8d9bae9601b95958a3ce8f9a9
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 10960 bytes
SHA-256: 6cfa75c344db98fe6cf547f833179b1b0f6eca5b9d897db3ddd9a2d515c99148

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