Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb83a51b9146447…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 23:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75e5340365d36d4857cbc2b88c15df5c SHA-1: 69ce4594209d4c7fabd7de2141e20be800f24009 SHA-256: eeb83a51b914644784c017ea6dea8a04f395c6f4ec96632590dd61591d511fb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it is designed to exploit user trust and lead them to malicious content.

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c482e6cc13---kipipusumofileg.pdf In PDF document text
    • http://studiolaviano.it/userfiles/files/kegobirodexetesumitexaj.pdfIn PDF document text
    • https://polaria.cz/images/file/13594813379.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/jijadasotosulubilal.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/23763310.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370867b39cd---58172775084.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eu1a5nobrqv63oe4iqt8vndjp/4242919640.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/996102927.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/21102421925.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///fadexiwuw.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109012153555010.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317201b9aae.pdfIn PDF document text
    • http://bociany.sk/media/file/70090180882.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/50991376872.pdfIn PDF document text
    • https://tomas-music.com/contents/files/61035112399.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/barusiki.pdfIn PDF document text
    • http://klinok-saintp.ru/files/gedakudopupazegefimuga.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/konujumuvewog.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3f8e7a1a---38805600615.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/61825566876.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/mizudawagesuxugez.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613470d4d72be---38370468948.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c273dd67fe---32875662265.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/mibimovunatokosixuzub.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xukatumagunugaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+file+system+typePDF 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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10592 bytes
SHA-256: dc6dedf621a6903d9abc34cfbbd36abc698068cab4a1e74a670e4a3760f6d5eb
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 16896 bytes
SHA-256: 29663105878622cdaea83632fda840f17e4bd1138404310b50dec8ceecc9dd97

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