Malicious PDF — malware analysis report

Static analysis result for SHA-256 0194ef1eae4b2c71…

MALICIOUS

PDF

92.2 KB Created: 2021-07-28 06:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12f4b5f813f48792a489242a8c7a8fe8 SHA-1: dc13e8c8b159c9a88e92d44df1ce655ab7862ab2 SHA-256: 0194ef1eae4b2c71f921fa9d54c0aaae115f60cd27e7fea9f2fd83bbe58d6810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a likely intent to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://icoachyou.biz/images/ckeditor/files/51411143755.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p4lh1upjvrbujkh1jc28sjudea/xinovejunenonevadebis.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/binovezikesa.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wutukigonedaji.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/49f7kardut7dh8g31bkrnj3j5d/31105019626.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/75007838972.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/40548575489.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gb6uplve7mjqpcc0oi32v78k65/ziwiwexalebobaruzavare.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/25597335082.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/65962666770.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/11023104036.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nemiv.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/53080288338.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/16778893929.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160856d0c1d7d4---gizuludopabuwojuxipe.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/rolufedora.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd5e9ca26---gidunitujibawusagajilin.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca220c42fd---loxozopuzigedu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1a1759465---rurekodafusemodiput.pdfIn PDF document text
    • http://polkovnik.su/upload/file/dujevabawimifinika.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55c08776c---79423106541.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/22889011857.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zizoxatemivik.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fed7b2e6d93---wevome.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5fg78ie9nv954i42tjcfmkg7n3/36594707671.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5c791ab5---kowotabaramixesixaser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apostila+inform%C3%A1tica+para+concursos+atualizada+pdfPDF 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_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 20092 bytes
SHA-256: 91a81f18da411839a5de3734e2744437aeb8a00d9de179ec33a9185c6a6c4943
font_01_sfnt_off00012e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 10968 bytes
SHA-256: 9bff59c8559f272fd1a3a6f9f3265922ec3ae5cb77ca5059cdcbd91ad88d37d4
font_02_sfnt_off0001476e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1