Malicious PDF — malware analysis report

Static analysis result for SHA-256 973d7f6d3ce1aa4d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 12:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b72ae9b80c570add36e21c094c4417bb SHA-1: 1222d25a3c35a6002cd46d486228d260a9536a1d SHA-256: 973d7f6d3ce1aa4d93c13cdc48a48c6574c084a71924557948826a7fce33f658
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439fe893c93---47763699263.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b367bace8---gisumefixexas.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd697dd99---4156311101.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/53987341147.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/65969787428.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/zuwadofor.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/jisesajedogalenexer.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210913102548_320059036.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/651910ace154befe2ddc36ef86a868a8/felipabotupot.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903123610.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/eg79g08hbas0i8ehs2kf7pqu61/piwesaxif.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/limavefadinamaximadireg.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/deninarifopogapemop.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/puketozuwabu.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/11745647011.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/59874027645.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/zisafasemope.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/81fb14adfbb23b9d32009a3f110c6504/kagurutuduxakiwove.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/84347175172.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/xipozoremamaw.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gezubakuwonoxenodib.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/67568895412.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210915144529.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/16619710606.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109052205436851.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/pikogidodol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=house+of+wax+full+movie+onlinePDF 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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16336 bytes
SHA-256: 93c0834101801e32d1054dacda7297a547e1efa74a66d778aa0ae3cf8f83f70d
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 10524 bytes
SHA-256: df17c6d87dd905792cd02abb3afb0287d4999fac55ede2bb58b936aedd37033e

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