Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9fa00a779f6915…

MALICIOUS

PDF

224.0 KB Created: 2021-09-03 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25ee15763ff9747d8a44787ad0e527ed SHA-1: f855c84e7a51b9e7cd8a8d5e07a2a42bf5799d78 SHA-256: 8b9fa00a779f6915bbace4140e339198d0ffa010bce78fad9b22beda91f17eff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing attempt. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b7ffdec52518f4183f72d331f1d2c7f2/61251436849.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22036f1548---30619249113.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/68ff0994610f1172f540d2ff8e7bdda3/murumizu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/vebatisefamaf.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/39093775680.pdfIn PDF document text
    • https://coluer.ir/documents/file/wukasogutawabokajeze.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/20236936350.pdfIn PDF document text
    • http://geodez.com/pliki/file/51008132629.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/87794276701.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/38301283403.pdfIn PDF document text
    • https://qnzar.com/files/wifokokulifobubabunafa.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abe09d6e653---vivawiko.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/vukopala.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/zasunuwetolaboruzax.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be50b74e98c---dadaw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0d7ad74898c7ad5910c5e19d68b79dff/viriluwegudutomelajo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/jofus.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/23033151177.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a08090858a686f1586ccc9785440f5c0/magavelupogejipuximi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931d45446e1---93253013680.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/10579b01bc9c994e5a01eccd2832dc98/7675045483.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/42335171124.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/bosukedakenefetuguguvose.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2aab64a0---gokalop.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/89c7160ae9db7c0e645bb1fbb322af1a/37365201966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+de+instalacion+sistema+ansul+r+102PDF 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_off0003067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3067C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00031e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E8E 21868 bytes
SHA-256: 7e46789a4f2dc61c179a3ea8c36cd9b60b519d1ea44e52d23d2138c026350e32
font_02_sfnt_off000355b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x355B5 10916 bytes
SHA-256: ae5e81eca580f63315b87e9a72321d65031a4adc453e81d5d431e63069e64390