Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c5d60a6f58091b…

MALICIOUS

PDF

82.2 KB Created: 2021-06-26 18:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1f2b597e615e7282233c26d71559f50b SHA-1: 26423bd9051c2264384a64bbf7c3f502f108ced5 SHA-256: b3c5d60a6f58091b98da00642e9da45801a1df9e8cf5a2e9ad780def04da78e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lensprovn.com/ckfinder/userfiles/files/6815858271.pdf In PDF document text
    • http://parkwaywest1974.com/clients/861606/File/ninuzog.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/352fed9e64c6b530e266d364f404a860/mitijugowejisewedituju.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/47520306134.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ced1c645---86393652138.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f5b0a303---71436802446.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/59234773070.pdfIn PDF document text
    • http://greenbrier101.com/userimages/69693933845.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/genolesuvunokemumib.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sonukopujugu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/e2v6qfhor2j75jn8uii55g50tc/26009508809.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghvpmqv9r0s1c9ieafnij3ibl2/53959442970.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c7a7ee7588b47c664c6c8a85266607a5/xolomeguw.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510132017156.pdfIn PDF document text
    • http://webbuilders.com/files/file/xipelanol.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a87927056c5---35300614570.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fogufaxixumawaruweb.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/76617a562f882f4f57104f131254ef82/4933402503.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/matezejepurobelu.pdfIn PDF document text
    • http://mosjob.ru/images/file/80721217001.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/57945034236.pdfIn PDF document text
    • https://fallsplat.se/file/86614833417.pdfIn PDF document text
    • http://promador.pl/userfiles/file/vulojalero.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b57abd0134c---bosogimibuxeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mains+water+pressure+too+highPDF 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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 10664 bytes
SHA-256: a8dece4c04416641f9c56b64b5d52d9223e8aa4dce8dd0314d46a797aeaac0ff
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 16456 bytes
SHA-256: c3be143a73acfff3cb39f10607e77d245d2e64307f2ebf8fd4dfafc26dd9d16b

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