Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bf32654bc238d7…

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 09:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e916f08fd4ce03dca79541b892aa1e7 SHA-1: f32631bbc2b6d5681fc8c26a5d7d990a66a924f8 SHA-256: d8bf32654bc238d7f854c95c5696a4a214011525cf01cdfd9c66263067b39b2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination through multiple redirects and compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=usmle+world+step+2+pdf+download PDF link annotation
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/23863995160c2a34d87c86.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/32863899576.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/roq83aqq4n27qsmv0ng8o0hjfg/pesajuxibozijirobed.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/roxonowatiselipema.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/haeu34eqo9c0heie4jnuuc8r0r/657966417.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/zozifawewuxipe.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f4307c6e900bc6d69528165c14d492db/7166245350.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/retufawagixolo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/zesex.pdfIn PDF document text
    • http://stromzeleny.cz/file/xazadavutetedafu.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lenenamebaxizedodukenoraw.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5d2f17aafc54885cfd55f0eb587fb7e8/rigesajinululadu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/8oi5hpa4jl9m7b36nc5k0teebn/69950582508.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609612e248210---24212713390.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/vufawogerak.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/vovedakerosajatunezo.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/burusiwubudanogos.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883aa60f31d---39529033625.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2807b8b0e---muxafimafurowoxubureloku.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/lozolupagamudugesuli.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/2dc71bbcaa7f47ecb51840fd78a44ba3.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/21988482220.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/42677973380.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2e3ad90d---17703895794.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_off0000b401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 10780 bytes
SHA-256: 9864154f6d72425e9f36319bdd9977f7e6b1ac384e3f076ec463176970770e1c
font_02_sfnt_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 16728 bytes
SHA-256: 71271e78921225bce4e6a28e292d58d414db67a22ce66cf8a617c0aa3659d6c0

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