Malicious PDF — malware analysis report

Static analysis result for SHA-256 6724555ad7716b49…

MALICIOUS

PDF

118.9 KB Created: 2021-07-01 11:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 33bb38290d0798b4877bda3f2bcee8b6 SHA-1: 4c9f747cbd23cabf70b9f8c2f19cced72d30140a SHA-256: 6724555ad7716b498f3a858ba4bb17da0d7e8821097ea6754b7f69cc1bcd97b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinarioscapindandrea.it/userfiles/files/26703761293.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aa25f142261ee6c9c538527a6254dd57/94310273750.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/tiwaxeginojetulejufonaz.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/69204765721.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ef848du1f88tuk7igd3so2lj2h/vulogos.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868de505a13---80914751488.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3506eab31---70441002602.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb616da40c---ladogozifapasapag.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210623022107.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/wuvupuzedepixu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/365ea43f4c57084e7c4d0fc192a50313/lediz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f494e823ef---69388048590.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/12453246498.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/gqged9v2hn4ci3g52vhaddjlmg/84557616050.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/zeforagusob.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ed45530a---60557020981.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2c670f86---fibolo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jewakebupuf.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/2811020489.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/darefosolekov.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d24e4bf0447---furaponazumifujum.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/18349763452.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c1e144f2fe35aa056c47e4edd6d8e897/11655204896.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/65527586879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=clion+rename+projectPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 44376 bytes
SHA-256: aa50941df9b3a0c19de344e51c16615811295ac01c95e2473ddcd53dc4ebc86c
font_02_sfnt_off00018048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18048 10528 bytes
SHA-256: 4a8cc7d2468a84041560c4e1d17e464390690d7f40347c79f47a613ed4f2a564
font_03_sfnt_off0001982b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1982B 20736 bytes
SHA-256: 77ebc55e15e157e56bafeddb30b1654b118bd5785ff8965926ba32c64cc1aa5c

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