Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8347a669c207296…

MALICIOUS

PDF

85.7 KB Created: 2021-09-22 19:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdfa56b3c86dc93a1c4e26a2fc2f6a56 SHA-1: 2a3526575a25dad9456392204af1c62fa302dfdd SHA-256: d8347a669c207296d985342371f779567499eb3a2073a1ee7cb2f29e72e75be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=power+of+subconscious+mind+pdf+in+english PDF link annotation
    • http://staceyasp.com/UserFiles/file/dolem.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/29741088271.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3cgnkb9ec1f24heo3s4mip1knv/bogeno.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/vowuv.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/52557150297.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/rusomibewusufusover.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/xosepowuwud.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/mujedivojijanip.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dff5525ab---74309545699.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cfcae1j5ejo1279v1eu3iuu2jp/83619255602.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/sisij.pdfIn PDF document text
    • http://klenderbio.com/upload/files/kuxepusadusezakidile.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f42ce7136252116da7e8d7912666e13/42934414201.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/vurewomorezig.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210916125141.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/nubiluxa.pdfIn PDF document text
    • http://thepducphat.com/upload/files/5280561494.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/56285462595.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/4835272600.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/mibavasiwufevuta.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302a153261a---vakebaw.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/jelawunimo.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/biduj.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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 11136 bytes
SHA-256: c0aa9377b6b97b6cb42b8ebcde08df4cc6630fbb250cf1bdc5e817a04c5db4ea
font_02_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 18208 bytes
SHA-256: 5d6dfc18ba2aaac21e02bf99bcd8cb125452267c28cc7b37b27155335b021cb3

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