Malicious PDF — malware analysis report

Static analysis result for SHA-256 3396474e60caad9c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 06:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5afd4e345ff2ea0a8889f21a85b3c53c SHA-1: bf3ac1a475011a4fa13408a5cf25d678acd58aad SHA-256: 3396474e60caad9cdbf5142f2421663f7babc0f6f7ff0cb5e856b752bd10443b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9c93860a---xobefefexulin.pdf In PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/vefenezodujerulomaw.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6264968c7---komoxesuzukopakonipab.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/bazupezidagolexirezudi.pdfIn PDF document text
    • http://afslab.asia/upload/files/xudede.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db4e94a31---bitikimanew.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/febapade.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a1d6331d---gisox.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/13289784834.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/vijetavo.pdfIn PDF document text
    • https://tisuputih.com/contents//files/30616998144.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/45008516072.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/79082804392.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161155401de9cb---wepizilinamarisorelaxo.pdfIn PDF document text
    • https://silga.ca/userfiles/file/tetenesugadobodikuti.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/siribiligevelobel.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88081ae126---xalawur.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf54363d8---77106731651.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/narofavusadirutorizufomig.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7252028f---fitoxu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/6169481868.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/vesimu.pdfIn PDF document text
    • http://mp-journal.com/media/file/xuzube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=linking+verbs+predicate+nouns+and+predicate+adjectives+worksheetPDF 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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 16600 bytes
SHA-256: aa6ceab8a280ed7fa70258159aa6efa4199513b0cb513882d2e815ccb16ef1da
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 11320 bytes
SHA-256: b18161038ee1b3f24822fc0d47c546dae291d815c3eef6e290f30f0c66d2eea7

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