Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bd5bbe15aeb5d6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 00:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f12f2201b57296119b7915ad0231490 SHA-1: df9a5026ce450a831474135459095c44bec5b560 SHA-256: 46bd5bbe15aeb5d69ba82107f7938c55e250f58b94598e6c3de4198c406cb481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://artofsurfing.com/preview/ckfinder/userfiles/files/5456645816.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/kagapul.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/nuxuginodepu.pdfIn PDF document text
    • http://chinalabware.ru/d/files/31255743721.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/29732177559.pdfIn PDF document text
    • http://rococosofa.com/files/files/4296136599.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921643e1267---27373335379.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/08d6b1e31493f840408cdf32b68ab47b/legemidatuvuruzisase.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d5cba1382ef6483a69e89e5eda65a319/63885826854.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/matosoliresulabu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-16/20210816140256724763.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/meruwaxomebiso.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/5026153061.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/12570247149.pdfIn PDF document text
    • https://best-label.com/upload/files/xumisikezetidipewuketoj.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/85480744103.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tulurugumirigenudopivu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b70375813---ramijuzugifomitimezotorap.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/luwelupupuzilogod.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1798889518709fa5035cd62c05498387/48363163236.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c047c0ef9a---posagaduj.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/93994051937.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/55325281479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vehicle+owner+manualsPDF 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 17344 bytes
SHA-256: f2e8a411f3cb17a479ecf42f9b79a598ad285f650ab0b63924d5318a4836ee3e
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 10552 bytes
SHA-256: 8e2a8ee47f77fa2e7228d16fbc97969ded6a8c3439ab098d3be4c07a0c608e27
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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