Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c67f85634020b2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a76f1d1f8cfdef2a44712228ff413364 SHA-1: 771cd34e10f95d3ffde679ceeacda304dd27f79b SHA-256: 52c67f85634020b28f1bf90e53a84905909bec279fb7b6b468a42b5b0b792c33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://hkbca.org/UploadFiles/file/20210827204815113.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1lsvepd4osko371698aukiafja/51350003731.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/24102931243.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/5605615723.pdfIn PDF document text
    • http://www.moyekolodin.com/files/54330011328.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/attckhkm1a785led8ipqkusf5r/93394500577.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1b3a73162f5c51b86e6e8a4f3710049f/jibixologar.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b04e4cfc86ffaf43172cb75ede5747e2/wisafokazi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160747d459155a---97091210248.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xuvenowutosuwager.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032b7d91a7---77281429858.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d403818e---wobejawabipeleronen.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5eb3a56067bfa013b9cbbba3b5ac4590/98256533844.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/450237e75502fbb0b2adc4cfdd0848d6/mevoraraki.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/43e66f5407f9c809998c0dc731bf66a8/12522553609.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/zowamagimokiparinuxubulok.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d25a6d8b---tijazisunujazoponima.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vb2mk83kdju9vbcr8t0pl645pm/85162850973.pdfIn PDF document text
    • http://weingut-suppan.at/files/90580270654.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bpb5bne6n4uu31rj9nguntn6o3/98328216554.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/30073634676.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/99342919085.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/tugiwijanogatokivuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+start+a+new+crypto+coinPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 17544 bytes
SHA-256: 37cb9c729bd133834045e5e5f18e6b9cf5c885c1c82bed65226848fda1dcd1e8
font_02_sfnt_off000130cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 10512 bytes
SHA-256: f949c7cbb768aa8b19c51edff7d6d78e0f9465ff5fe8165370ff52f843886353

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