Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed57a685dcf343e…

MALICIOUS

PDF

84.0 KB Created: 2021-07-30 02:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d204bca0508a3af7df885d78d1ce622e SHA-1: 07543117ff2af266cb7db35af5d5446a9151daf8 SHA-256: eed57a685dcf343ed77d346982a7245a6a7014685c527cb30277ed8fe98873ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://tysons-cafe.com/uploads/files/fukewesopolajoza.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e7bc0d9e---tiwasakeloroxavidaza.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/wenisoduriferud.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/54912845099.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f8237543---10330586818.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/88877ce7939d06f233086a67f06e353d/denuserirubadalono.pdfIn PDF document text
    • http://hangquangauto.com/files/42858104483.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160987655516a7---liluvelekiwuto.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/sinoligowewewet.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fatidekuludijoxodubuzagal.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/77320423978.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f39d18743328100bcaa379c9e520d2f9/tetenapurudiwaxobefu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/99p45mmqsv330dj6i9jep925s3/38255090989.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfab6ca8d---28130162754.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc311f979---58473542524.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/175e3b6e1b04d45aeb6f460650008d05/zuvopusepavivaj.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210606094225.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04cfa9e6c---93615762110.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/76fjudl8hfqmusa1d2uqmivde9/99962295545.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tabazelogukexaserexuk.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/sorefavugevedafawana.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3bb227123b943ecfe51259778c90795a/59992749132.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/xopagukatigef.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/59634102435.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/dalerutivuwavalojasi.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2661a060cf1776317aabafff365875d4/munalezomafa.pdfIn PDF document text
    • http://nsck-cykelmotion.dk/userfiles/file/53154564072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=buet+msc+in+eee+admission+test+question+paperPDF 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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 10928 bytes
SHA-256: 5c533572d1972acf77d75807c78213a074c8bb855fc8efae400f91b6eebdb2b0
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 17012 bytes
SHA-256: fd5f0bd9f004134b04f266198f4a8e9fd769c6e8895ceb0b383b9cda129631cb
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1