Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c363eb6d141acb8…

MALICIOUS

PDF

82.0 KB Created: 2021-08-01 08:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3c5bc8fc244fa3dc2f3b938145257d2 SHA-1: 38c78569159690162ee3f0cf4b975856ca1da056 SHA-256: 1c363eb6d141acb85e47e66dd1f10f0ae9be811988a45586f11bcb0902150e91
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm or redirection scheme. The ML classifier strongly identified this PDF as malicious, and heuristics confirm it is designed to host external URIs, likely for malicious purposes such as phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to assess its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610573cc2e0f9---dejimipuxezefupetemu.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/476b37902a64361071dbe66c9d2e10cc/95534311072.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/jewelurotuti.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e0d829cc02c11aa74f79b8cefa020fd/30963719994.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/mubalekerowiziguronixuv.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0c0dd8c4d8632e4cc67f31ace57cd04b/tixixev.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/xagiwojakab.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/05b1030746d8ed6e012b5a2c6ed1aa1f/ganabowajudigifelumubupom.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/derekigogozurexixedujej.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/7770932767.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e375c5f01d3f62c416319c8e35be5859/18410896513.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/segowifawogaraleni.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f72ba274566db68e6250fd8932cb2853/rexutuw.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/furodozefedumib.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/25f6564d607c43c09a783c342a16dedb/giviwinowebemidisu.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/14943816505.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b6uumip281nhtkb7mo3jd0km02/75883118397.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/21443047585.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/71128984149.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/959542cfbfeb8084914c10763df83cc9/jeruxupilejafaxuxus.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5861b418d468da734534b04871707cce/92436738390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=m%C3%BChendislik+ekonomisi+kitab%C4%B1+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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 11128 bytes
SHA-256: 20129335419b5878eb0449966b16afcf1db64f54c439bccba9ff971503bcf1bd
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 19256 bytes
SHA-256: 03ccf3cbc3e9a6aef6fe06205cfce19b12218b41fe07c0146f8c3f2ad77e6f07
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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