Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3de81da1efd728…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 01:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d219caeaa8b715657ce7d189282dbf5 SHA-1: dba286f042f5667bb3fd2f8d10241fd37bd2e6fc SHA-256: ba3de81da1efd728f8e623328325e624354e798701908f528f8ea8b093fd2659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://uleiuri.ro/userfiles/file/fekud.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0170965540ccde97dec52af9f4ad220f/74956299144.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144824344b06---34063668874.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/wuwerixupap.pdfIn PDF document text
    • http://agmapure.com/upload/files/sakaromagijelepi.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/buripimunebitizajovem.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c8a6aa1f7aca2037e8618127c341b713/87075721695.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/34724530000.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613432386ed8c---fanoreraxasabasurawu.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/rosuf.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/64634883739.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/72290327170.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/96976060430.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/63780052467.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/gudogonenorawesuni.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/82021976086.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/lisilatuseg.pdfIn PDF document text
    • http://riviera.az/userfiles/file/53074421618.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/jesijakevozutirogojemog.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143f2b8ce117---nosafotepupi.pdfIn PDF document text
    • http://fourfoods.com/images/files/robudiw.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/6827986906.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109030529228346.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16144e764ad3fe---87435537936.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/vetejidu.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/vudapavusolol.pdfIn PDF document text
    • https://polaria.cz/images/file/40106034660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fifa+2012+apkPDF 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_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 18176 bytes
SHA-256: d531fe96e1911f1d094e313e063392f02bfbf93223ae9109d57df9232c260056
font_01_sfnt_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 9944 bytes
SHA-256: a96ad7477c0c158bf1a5e55825ecfd5d5331a62c7e6171f741097e9da45dabec
font_02_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1