Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7960e160f207bb…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 18:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b9a1d1a52c5fd0ca6192e86b49518b4 SHA-1: e35b495803496ea48e91649092d19cb039cbf73c SHA-256: bd7960e160f207bb47f642ff67c6134f19a92bfc6030a593844711524c16afeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable hosting and compromised CMS uploads suggests a link farm designed to obscure the ultimate destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://abwninemile.com/uploads/files/28664374680.pdf In PDF document text
    • http://etcad.net/np/upfile/file/mulogoje.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/5176049253.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7jvgunda77pu7qjaqqujf3dnd6/75296171479.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/fe69f65f594ca1cde8e76ec4033c5bd8/80413985651.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084aeefba807---46622469888.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/10eead4e4ff9ec732bd36f26c9c498cc/givebemosozevu.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/24102057025.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608718a0e89f1---sovenet.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34cd189d4---26153463937.pdfIn PDF document text
    • https://www.naturartshop.com//ckfinder/userfiles/files/53585444697.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/am0pon5jm1j62e8oggmaq3ac8j/12367335453.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4al6m1nop5gsnfmd43sipgp8aq/dajezezam.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/59452074031.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932c540ea9---sefenexa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e6b63e7281f88686c0cce87c74271009/38010049473.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4e609f6a1ce15b5e52f9c0ce2cb5b2d9/71626896210.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/48303433826.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088217c3b12f---46353905549.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/93qc3uf7ek6fg4h7dg5efbc0ur/19989072412.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086053ccf4ce---xigupokitonosafi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082da5cd61db---5642255778.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/tiritefijosutab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=battle+for+middle+earth+reforged+steamPDF 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_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 17272 bytes
SHA-256: 53e684fdcdbc3f7662e1b559f358da3f5e7e36b1bf4056db87a2a04923c49159
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10752 bytes
SHA-256: 19b7e851acac53ec1009ab43263a0585613bb9241eb32bc50660d18394cb4d4c
font_02_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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