Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8748e86f5112bd3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 16:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4be72a4c1e27df74ffad2f3ffea7256b SHA-1: 6143f80dda1e9bc453ee6cf62dc031ede38a0adf SHA-256: f8748e86f5112bd3589c37856001afc4c11bf1f8b2cfb7772ca89a1e7732048b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=combiner+fichier+pdf+logiciel+gratuit PDF link annotation
    • http://polymer-optix.de/userfiles/file/43347968675.pdfIn PDF document text
    • http://enkepharma.com/upload/files/86538196830.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/bitowererozi.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/qosb3h3h3i3034s4m0nl04afgc/bufexawanidusivediridifop.pdfIn PDF document text
    • https://laser123.com/geektic/files/28267456682.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/pumofun.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/58506465055.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/22303265972.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/wiwekudomo.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/23275088046.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc87bdf39e---78378520255.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/on50dt6ufnocp4u95qbpf49bgc/67447397362.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4177655f7---25614730183.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/36223366793.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/84153072565.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/tizenijulifupajok.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e750aa405---lizoxefulagaxobimo.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/toposaxebosukobef.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/28260433025.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/kizobuwopos.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/zenosefevirapifot.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6875bee73---zamijeriwegugoboji.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/49751835187.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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 11172 bytes
SHA-256: 7494c55d59e2bc7294e55a025fdcd81582dc473c4e5173b83de7afd23bde7e49
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 17940 bytes
SHA-256: eda1237c37b4881c726f3dfe102852917ae58a20bd93b2e1358e307469d71f49

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