Malicious PDF — malware analysis report

Static analysis result for SHA-256 8729955fcc7a3634…

MALICIOUS

PDF

113.3 KB Created: 2021-09-07 21:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 504fa91e4f5414d9b378e111cc7539f8 SHA-1: e5be988cec7c26f6661d3f352ccc10b3faa452b9 SHA-256: 8729955fcc7a36344eab4f5bb65bf98c422325995c4047d1afde31f2ce4d7311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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 https://drafthe.ru/uplcv?utm_term=new+fsep+manual PDF link annotation
    • http://liweisteel.co.th/ckfinder/userfiles/files/49578960239.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/tilefavitepo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/034b82395a94841e9c1f80391596641a/68848903149.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288fe13c6a---kexalalemugogolax.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/336080301f75adcee4fb12255dd9f928/xosonetogizaroda.pdfIn PDF document text
    • http://twtime.com/uploads//files/202108072214425330.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/90782224997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d52300095---kiratotojogosufas.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160987f07861ae---5035310596.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c4a2b3e---kikebuj.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xulonu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5419f8d1---sevoxup.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/namiborenapiwulakomub.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/ponozab.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/10025459643.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/26926879410.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pvgmgjcheblvve2eh9soolepeg/66786884585.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/vozazolatabuganomudi.pdfIn PDF document text
    • https://zold-kommando.hu/files/77114604778.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88932477734.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/kebebatidebelojojenapuxut.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a8f62cb5c4d68f28edc8bffa1060dcf8/vugepimadikarizoki.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/40971969272.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/65287869053.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/45274854204.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/74523577407.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_off00015b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B07 16928 bytes
SHA-256: 0663e38439a14c7a1e8e195414d5fdc70e01461b78172a242e8da4abb8d2f4e9
font_01_sfnt_off000186dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EF3 10272 bytes
SHA-256: e96d001085d37ad272c9a92dafbead3fa9f3ce22cbcc3b315b8c424a2ef07945

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