Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2a2fe0412b3d86…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 17:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 279630be481ddc23af8fc06282ef6c62 SHA-1: ae252066b2f06f2ab33dbadc7d6e38269964114c SHA-256: 3d2a2fe0412b3d8695fc29c15c9c868b79a4b65330ec59c6f1bfe63ae5887426
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to facilitate the download of further malicious payloads. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8721d9481---27014939246.pdf In PDF document text
    • http://dd-eng.com/files/files/854854770.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3585490f3438ab058773c789fb33144c/65897334353.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/pafezimapewuv.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xusijotupi.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/zadigenejudozafi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/773d2f7ffd5af77b7e7df1f08c773c3d/58066265139.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/sarabelumokikiruzuk.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/34889950019.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/92639625100.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607845b667182---18052233593.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160811fb2c3ab9---bavosibomozagi.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/jifekasenuwamemekida.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/kotuvexevuvugit.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/nobenufomufevuponebasa.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/62578478687.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/kavem.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7341b6a41---zetibopuragosela.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/j53euak849u1qrbv52sdaa4l1m/36712821364.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/24199562787.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/dipolalodedak.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/geritizova.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gc9o63glsjdbbf74r6peg7p77s/17145331223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+al+quran+%26+terjemahan+pdfPDF 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_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 18388 bytes
SHA-256: 13e65e72a6892913999d9d930c5e22faf146452f8662dcbeeb64eba0c03309aa
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 10084 bytes
SHA-256: e4036bd3503d38b171283eda8d608bfff6ba9e5f29a3679b95ddaa55edaac55c

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