Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e1b29807497e6b…

MALICIOUS

PDF

119.9 KB Created: 2021-09-04 21:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c8ebf411e4035672b8049a565df10a4 SHA-1: 43bb66086537e5ab01207a4666013829ec6f339d SHA-256: 52e1b29807497e6b42787504092b64459a0f7d6339fb19abc979fedb7a99db57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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 http://enricobarraco.com/files/maripipuwevos.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d7cba314---59521936694.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/migejemarakijusakipojaxat.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/24486923334.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/medupenoronikukupujugo.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/tazupovo.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/4786078362.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160907ef04f6b9---vosapenatujukapaf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81238236441.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/40458551746.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/77886135943.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acddb070215---wupemugurumarul.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/kopufonikamumuxij.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/36nr1s4a02hmcbmspdrjv1sbu5/56024484728.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hrtrmmf00hi9ldc3q961f0el01/pevizubovezazipabuze.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/zizaf.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/rujibivumusubun.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/kixefiguponorinuga.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff0340b87---46627023468.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/73873649687.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/muwamuzafaziviwezumowoju.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/17016728691.pdfIn PDF document text
    • https://digiconelectronics.com/media/pitivufabedima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=el+matadero+sebastian+echeverria+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_off00016864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16864 21332 bytes
SHA-256: 70fe7eaa35067e3d5074934483cd4aac56469251735ed49342ad733a23c66ea9
font_01_sfnt_off00019e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B69A 11076 bytes
SHA-256: 667d89daa91837cce61685d8f97bac346d26858f0e024039726c39d38029825e

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