Malicious PDF — malware analysis report

Static analysis result for SHA-256 904520dd097df289…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 15:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73d37e4b493846eee4d677ddbeabf974 SHA-1: 97172ed7bb9e14355235e49bcb37beb1cb7c7509 SHA-256: 904520dd097df2898efa199f22d5a60f60614dfcadc880c30b16c65bd99e153b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://honderhotel.com/UploadFiles/FCKeditor/20210911180850.pdf In PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908120919.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/novosolunobuzogiforo.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/15483121962.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/tobewovebefavizexunikipe.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///56839992444.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/pelukalum.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/40588838669.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/zezixopaxusomawopejedapal.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/govuvobokazilufenedavu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613875db78cb0---21634647457.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/77529410761.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/njmvbbcpfgi890sdhrfhp41a10/99415921992.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/88583959242.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/nafis.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/70846892638.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/nagibidozolakok.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/39403294817.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5e6a9449447763dd5e23db682278f330/59083288660.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-16/20210916170103302819.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/sawokarisoleliriwe.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/kesituwekejakajevavexaba.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/45bebd9e7d5f3559d3da36d2f0f6d80f/81037912438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+bachelor+australia+season+8+episode+2+watch+onlinePDF 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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 18588 bytes
SHA-256: 1f89e49c6bd92959fa02d1a35160ad45103825a15c8a1bb3f4edb3e2630dc4fd
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 11228 bytes
SHA-256: 85342606ab0d2b7d8325c9e7a198c3edce918d440ab70baba74a686c2526e057

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