Malicious PDF — malware analysis report

Static analysis result for SHA-256 625c6604cdcfd0bb…

MALICIOUS

PDF

82.2 KB Created: 2021-08-17 22:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 356c15dd3ee601efb439992353e2a1b7 SHA-1: 90b866ab792c6706ccaebcd2d4d7e599f3a98c7f SHA-256: 625c6604cdcfd0bb8dea0b17647fa0898befce3ecbdbccc6d8307bd2fdaddaa2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cd64068ec---51735129718.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f1f46b86b41645d6f1a5abf697e125a2/retot.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/k61tfg415h28j20pmhha53j0ug/nedidulofapazabebug.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/vofepinafala.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/49809882710.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/8592944554.pdfIn PDF document text
    • https://irantruck.ir/data/file/zanas.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/65020245102.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d20eccf0d31f7db5ff3beb5d66767c9f/46371573942.pdfIn PDF document text
    • http://www.polni.si/Images/files/povuwugerex.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/jai71uht50kqehbc59l6l9q3t5/zulilotozavuzibexu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075dafb71685---6421233816.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/bibijimaxog.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/fagokedodamivebifimuxob.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-7/20210807024715261608.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vuzedov.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc78e46b3---gofusatumoru.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210706054216.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nafobuxamaxekijote.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7b966f080---wamigakutipudupubobenak.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835f6cd407---pimoposolokanuzorevezifak.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/80204d3c2ce9946215b21ca82f46f7ca/28250502459.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c09a29040db---pubajafadabudebekela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=libro+de+obstetricia+schwarcz+7ma+edici%C3%B3n+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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 11272 bytes
SHA-256: eca2ec28f414341816ef952a1d4ad5c6c0795348f7a569f6807e2b8c02609626
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 18272 bytes
SHA-256: 8d0863ef2aaad954241752da9eacd5c5aff9db95f7e038e85668dda0278ee83c
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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