Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a265a55df98c1b2…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 09:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0993a7ac8dad7b57e0af08e98b1885eb SHA-1: f3b2373e0d330cd49b201443828e530528b626c8 SHA-256: 2a265a55df98c1b2332b2fc6cf9dc38a44d4a222da874218b0b53ae6647cd83b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. No scripts were extracted from this sample, but the overall structure suggests an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a6bfc3415---90179965259.pdf In PDF document text
    • http://suspensionestg.mx/userfiles/file/76059387920.pdfIn PDF document text
    • https://lasanisports.com/files/venodoxumara.pdfIn PDF document text
    • https://aneri12.cz/res/file/xibubepuvosaremopogetuse.pdfIn PDF document text
    • http://katela.net/userData/board/file/40543388831.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/969e2e5e8f6c7f2d9a20cb1a1720055a/93076969318.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/sarer.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/97377873336.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/14387336012.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/wuxaxopubuxumulofadijik.pdfIn PDF document text
    • http://abworder.com/uploads/files/3460418338.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/84178617106.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/93680503433.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135092b7a81b---5070885639.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/nileligasurivotixexebe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/33046502024.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/92191843360.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/1784915365.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/41233249689.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/kpilf2k508ii5lvfjn8a7ti7k1/nesumego.pdfIn PDF document text
    • https://marosme.ro/hirek/file/3641597580.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/rutotipaturu.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sirosajadabunujun.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/73280963911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=unknown+sources+chromebookPDF 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_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10520 bytes
SHA-256: 15ad774484aaa1393de6ca62379fe3c0b23534da11c8d2e8dd8f26ef982d5b81
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 18104 bytes
SHA-256: c311f91c2e8120fb995d87bed1b117dfccd9d9840d4f782ce4acf711b87bbefd