Malicious PDF — malware analysis report

Static analysis result for SHA-256 710c6a97bfac3ecb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 11:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b86487bfefcba12a8d6b8fbe6d58f2b SHA-1: f4ab1cf640039cda4cacc698e88d4308bbb2f44c SHA-256: 710c6a97bfac3ecbd9ea185f9e5903541f5d940309d49e6c3d316708c83a3182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and other potentially malicious domains, disguised as a PDF converter. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qcv8e6al9s3pl5po2obv2632mf/wefobusur.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/45421391909.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/7143453606.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/sexanasekubipesarew.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/fofirirefevadisonemuregej.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074956b7f69b---25347221731.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd658116b0---vakebivadodarogavufona.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/norosopadogaxoj.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/pevedakewulupiwedibusuxe.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/xaxozuno.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/nuvukujajifuwur.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b4dd9d216cebae6d04d83770028c714c/68644285906.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/saredamuwojuzodi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309eb87b2dc---susese.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/xazabopowijenefake.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32497521072.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f0fba8ba---govubafavaxitiwarariw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c6f4d1b82787e239df31f8c6d009a211/35487467019.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7774472f---90122813271.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/pj79mkv1rec761lqibvbef27f9/25210139680.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611acc2357cad---78232061563.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f20c4fe2d737a234f1d56be470c5a3ce/27414066902.pdfIn PDF document text
    • http://119pump.net/d/files/42286369353.pdfIn PDF document text
    • https://susta.vn/userfiles/file/pirevarafimujesakulanoro.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e04d4061d---solilepegexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+to+word+converter+free+multiple+pagesPDF 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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 17576 bytes
SHA-256: a11281fc4bd21c8ab8a7ec6a705283e2546bcd08d31386292044ea10a0b2c83e
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 11216 bytes
SHA-256: 1bcc450bd80a1d09c111bae5762ba427cbbc41403eea8270a94c663d0f618b16

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