Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aea707c98d9645d…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 01:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 608e652f8c09c4849d75b82b55d40cd9 SHA-1: 9b1cb1d7eafbe04c6bd342e223c479653045def6 SHA-256: 9aea707c98d9645d410ec9b96c6be67947f87c3dc5e0291865b467a8d8ade340
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vvpta-irvine.org/userfiles/file/zusubexulivafotedijutaf.pdf In PDF document text
    • http://mathrainbow.com/userfiles/file/42859260470.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/57212286677.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/80022917299.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/zobutil.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/158b28e28219e779ec1d3ac0b0eb3b99/gotojule.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5243abc911f989a708323db60d137f33/50125617992.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6de3a1208---fegujodafabekorizelox.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/ridobovefo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147aaf1c00a8---58057365253.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/50631625913.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/selaso.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/15104180419.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/retenuvadafadopa.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/32065220660.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/12160728151.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/55261247153.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/85344320527.pdfIn PDF document text
    • https://sapporopools.com/contents/files/zebotijapusivepitavawipi.pdfIn PDF document text
    • http://tchid.net/userfiles/file/putifotejoxejaxaveva.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/68424038637.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/jubuxufafusasuvezibexotus.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/443337ea4a43b7f71167c03f3a0b878c.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fomasuwuku.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/40367577070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+move+pictures+to+sd+cardPDF 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_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10776 bytes
SHA-256: 4eb0b232cc99e04cec15d4cf249a8ebb8454db0c06daa15a33d461f66c52c8b1
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 18604 bytes
SHA-256: a13f0435c3b21a2444e64b95b2e032c6ccbefd592457cf88152869166d1f6e91
font_02_sfnt_off00013cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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