Malicious PDF — malware analysis report

Static analysis result for SHA-256 51afc6ff9e7de2e6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 21:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d2b10c1370fa1064bf24b144a78fa5f SHA-1: 18294baa1779806c52848550e2ab57f82c8c468e SHA-256: 51afc6ff9e7de2e652906c69324b090fcc1a56402f942faedd83f9a8c6996e80
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate this file is likely part of a phishing or malware distribution campaign, potentially exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://kibledergisi.net/resimler/files/pisaxo.pdf In PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/jijatuzekexatumabaxo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4e16f64---peven.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210815070021.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb43320f6ae7347d12862652c0f481a6/lutonewani.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/25407401621.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ce9df1c9327c3e9abe4563732d0a8cbe/tubitazatojilevuzevazofam.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210630060100.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/12969913000.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/60199657786.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16128930f7e5bb---mosaxavazizanasizixojax.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gopajodogututotalo.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/remiji.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/nabaxoxiz.pdfIn PDF document text
    • http://art-ball.net/files/file/68715828739.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/flebke3ic9sfv5ed1vf18sdtc4/40810400568.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/zasuzopisuk.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/48645430621.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b7ae5438c1d94ebbed19ddbd38d37b12/32536263923.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c94ee07f06c0af6bd2951f0199364be/tiregeti.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/28626519714.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0b954183---71751933481.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/54880911083.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/tumitewefopese.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/oemjrvpmjs7of6uj4at82o9343/12517429346.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kagotede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shell+helix+ultra+professional+ag+5w-30+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_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 19424 bytes
SHA-256: 2e5fdedee041646f8e935054bf6b7ee441448412c20f0fac1a57b3e750915227
font_01_sfnt_off00011b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13367 11604 bytes
SHA-256: 7cdd6af6d0d8e418ae3efdafd4d0dfcb4c9c8451adca3771d100731c2b51f4bf

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