Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2ff31fab604c16…

MALICIOUS

PDF

207.7 KB Created: 2021-06-14 00:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 618b227f10810e7420516441fd35b858 SHA-1: fcefbf95e428783dc7998150e34a98b6517fae87 SHA-256: ba2ff31fab604c1690c41b731cbf4e6ff719608bb605dbf797be9dfdd62289ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=demon+slayer+manga+chapter+40 PDF link annotation
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/da0d00083f4a1f052ba3cbe4e5a38ba0/ximutavivabufu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160829e757ec25---52069252755.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6453f7a2---90464588542.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/efh7s8co58ussk3v33ouak4h9h/liluvaba.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b40b87508---fonupojonu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2b6f9d15d08bd8e116eb74aefbacf0dd/devebuzagadoxo.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kinigebib.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6e01064cc0475e2fbf63e6817b2c0b2d/45611911844.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c92627b7e---44039143148.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7480a7de4---gitomorinimimi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b449e71cd0---85269369940.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/popupenivedagisarodi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848c4fd6fd6---67595065460.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/zotev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a4848478694f77f67b699f366a91cfc6/74572524376.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00014f2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F2D 144092 bytes
SHA-256: 935fc60dc23df82027ebe09b19521d27ac3457a5e25ddf6d5d26ec32f5c1783d
font_01_sfnt_off0002f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8C2 5680 bytes
SHA-256: f9bee04376dafabcaa0fca9f14d559093c936c4a6fddcc77416fab2369546145
font_02_sfnt_off00030bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BFF 11280 bytes
SHA-256: d79c9262770dc25270c75762b11270a893510d38dc48f5ed369ae05084812469

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