Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe0e19a829a1f13…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 13:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c8314efb6798b88c2526d8eb537202a5 SHA-1: 9831db419ea54f4df03a26754df9b5f6b3913485 SHA-256: 7fe0e19a829a1f13d5981a4533d84b80d779c040539e2787e916b44f3709a969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372ea69fb44---nunejawesofadeveloxo.pdf In PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210911161641.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/97696220000.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/jozoluvofegekamaturusu.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/50821849440.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109031444334066.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2eb88a68---suxuzipifititefoduto.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b477b0bf4020e5ff68d2c78374334141/ketukoratoraxuvekudow.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/83926221353.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/teranukubujegulu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dedc75fdd18a550b084bea32c0bfa069/68639328906.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/tiregaxojejarixowuzir.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/zigos.pdfIn PDF document text
    • http://arucax.am/user_images/file/godulinakujezenuduse.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/33806755370.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/xulaxufak.pdfIn PDF document text
    • https://maymac.info/userfiles/file/71670612396.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/bamujowomovalazagewew.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/36971746113.pdfIn PDF document text
    • http://chenruichem.com/upload/files/ponajimapujitenadil.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109081638436527.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/jesazemedevo.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210918_114219.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/24946983662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=a+positive+word+that+starts+with+the+letter+sPDF 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_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 17944 bytes
SHA-256: 3488a49b542ef5417e9db53e638b2b675c150994d888cb6e434a4b44a41865af
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 10520 bytes
SHA-256: 5abe18de556da7a5b08d10f965de9b03d2f6e15b89be4d85f45cc2f244e45576
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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