Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f508758f37c9000…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 07:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d422bb704f825d79d16102151cc50512 SHA-1: ccda5eb53f635ff419c07945f07578da56b57d3c SHA-256: 8f508758f37c9000c609fcaaf88e894974edea786ca3ccc99c337f30a6ec8177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://archism.ru/uplcv?utm_term=algebra+linear+equations+word+problems+worksheets PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef721b0cb---38433025974.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00082c44c---lozubilanava.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078489a4f532---kafoleluxako.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vh0ieekmmuil1uuvtakb44d436/wugaken.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ce1001aa---tuzukevomamilevimavibolu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/66185477490.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a2c68988---568098974.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4ca21c70deab572a09558a5c1f8fc9dc/13727883673.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/71921011993.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/22062640233.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/29575438046.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/rudomugulujusap.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/pafagolebememaxapedune.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f031e0ba7a1d01c0ace86769d32a92b8/82853784608.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b708971afe---rokibojapezevisabijobo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8fe42ab36aab139c91e10de75736d8c8/18650248654.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6395a3c0a40726cf1a7da6dafce3edf5/zemazijemaguzezomofuvawil.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a430d4e72cc---wubopapivuruwak.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083446ca222e---xipiliwimosajuzivejagaful.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/4035176887.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xaxufaf.pdfIn PDF document text
    • http://ombs.ru/uploads/files/fifoluxaxakowirejof.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ba9a8209---revuratuvomedaxeja.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/71840068292.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/764a9452b7b0a1ed045ea7bfd81c200e/jemixagolize.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_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 18228 bytes
SHA-256: 5e4ffcc9162c833e855550c42e61065f5effd8a72939655d5d9040d05fd88772
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 11384 bytes
SHA-256: 3398c7c9d3a6209ee535dc022a5539e454ab6dae8a6fbb5f31ef1965029572f0

Open this report in the interactive analyzer, or submit your own file for analysis.