Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3a5dadd742fa17…

MALICIOUS

PDF

91.0 KB Created: 2021-09-17 08:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 927a6a35f58bc8353bb03203142d1453 SHA-1: 35ecf9b49d2ed4087d0c1d3b87d9f031cfaf1fcd SHA-256: ce3a5dadd742fa175cfce3508ea0583b39edd2024fa0bf6cdcf8753af2a9c5e7
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 ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://absolutelyneon.com/userfiles/file/49711948537.pdf In PDF document text
    • https://hotlinepro.in/admin/userfiles/file/furamiru.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/pofepujoji.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9a576d41a9d30105cb7ebfa8faa4f7be/11076412105.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/wesevazarupulaxunelo.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/59042243952.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/fabupurag.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/kuxajozalujivujeb.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/48748429005.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/59728609986.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/subojokekefafole.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/debido.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///90790247604.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380e3a0d6a---ribavimozeborodilugutoxed.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/89638758839.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa4cb55a3---81183614429.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/94976803800.pdfIn PDF document text
    • http://epplast.com/files/file/41741415482.pdfIn PDF document text
    • http://myredm.ru/uploads/file/4939326551.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/zifinipapaze.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/sogogabo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6kmioqveoef5qn8ancv1nfi41b/vofadagibalopu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ef38d685---wolerepupoxerovibew.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tilubad.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cc9cfd09995dc072d23fef365a28ca2d/32322631969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=redmi+8+gyroscope+delay+fixPDF 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_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 18268 bytes
SHA-256: e75c6becf6ada6f5789b77100f2e6648cd59f8a02111a1d9c9f54b4925e55cb7
font_02_sfnt_off00014488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14488 11228 bytes
SHA-256: 3aa5cece49477b54cf1b7eaf4fb1bb0c5b02e735d83cc46852280764c6eb7795

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