Malicious PDF — malware analysis report

Static analysis result for SHA-256 988199838e716445…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 15:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c79b38dd4e00d1fb5d3fed300450c4b8 SHA-1: ff5a5262ab546bb2358c2e7e970b1eccc2018028 SHA-256: 988199838e716445d16723f3d406594f4ccc763a1ceb00c8099aaff44092fc86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://orgue-chantepie.info/FCKeditor/upload/file/gutixopomoputowikufe.pdf In PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/68433493164.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210720_103302.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0bn39onj81gv3bp2j0itu3fv59/simirezunazuvetanorifura.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/mowazizilokonufewibewuduf.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/62109450699.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/webexidaxigiw.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/660f322c9763e894e6413674179aea57/maxenopobowiwepukogumasak.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/54126299743.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/34929883667.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5908163d3ed99f6bb89e2470024095bb/82634403944.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/gagigunemotewox.pdfIn PDF document text
    • https://icbacademy.com/upload/files/9585343060.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/44218098956.pdfIn PDF document text
    • http://stromzeleny.cz/file/namir.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f7dbd4603fc8a30daacc3a7b8e92ee83/gowojiriwujixekogukavux.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b27d5f294---62167955035.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a97713e89563e6a7e555d3cee9e01272/28096275358.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/sogefobewajimud.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/82350451800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rrb+ntpc+model+papers+2019+in+telugu+free+download+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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 20460 bytes
SHA-256: 3e9404b16a329d741496c71582447fe4af8cfc2f39fa322da4656f1792db3013
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 11796 bytes
SHA-256: cf6365d169efbac41804256dd5a868f0d535ed679bc0ff05cde702f95d457722

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