Malicious PDF — malware analysis report

Static analysis result for SHA-256 99990a63a58a25b4…

MALICIOUS

PDF

258.0 KB Created: 2021-06-15 18:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 13e6d94892772dea11f031c8b4ca6715 SHA-1: 6b0409563109e1bd44c42de46df43e8e110ea17f SHA-256: 99990a63a58a25b41e967c809b7cf953f52d153c2db951ea5fece9c063cc3dd7
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 0.9552

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=time+away+from+the+grind+nyt+crossword PDF link annotation
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mjqfkd6e1ui9aq8hl87fc49ger/rufoperovafo.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/86847287075.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160752840bff73---79234371174.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/70936024487.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b99be44afd15109ae8de9c5fa77ccdbf/fajixa.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0q5164sf7fa658t96426hb6iie/kerokezuwotimuba.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb85b0c91---76845777600.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093262d74677---90163290997.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6uqs3sjcp5ka7mtk022v186vr2/92972873613.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/26e25c5036bc05f81e00cdc9e7bbc426/92679191652.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5cb509556b46712663270e61e82b4d02/95970355456.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca90acef0b---boroxilugawoburon.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6f2a322da7e3d29635e926e16cb56b3b/66218553644.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/es2n1683nfq18dvucggdcoqet7/fiwedikezulibaxuvezaferi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003803e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3803E 5544 bytes
SHA-256: fae93470147602145199e600ad8566d39186fc1352a08d8ed663ef03b02c52f2
font_01_sfnt_off0003930b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3930B 2328 bytes
SHA-256: 034c7d7109d4d71c314f5453949ec28c0d7c0598e0311acefe7a42e9fafb19f9
font_02_sfnt_off00039cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39CFE 8328 bytes
SHA-256: be9e4f620065fd4aed65727fea32abbcb625102fa615273d2055b0e0e9897fc5
font_03_sfnt_off0003b39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B39C 12560 bytes
SHA-256: 0156abf33d36176ba49a2f42f3fabad2c050d901824aa2bf9230f90451ee21ad
font_04_sfnt_off0003dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DEA2 18128 bytes
SHA-256: 9028be7403edf63d7c8b4b759fb6df27847b233b7bc425af2ef54aaa6f5193cb