Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2098b1dcf7359d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 12:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d23c90f52881262012ef7ef3f98f4502 SHA-1: 2622d8b2a1f847d5974f20209d8cac5b60d13c3b SHA-256: ef2098b1dcf7359dc106f19bd820ccd1532c7fc3df6de3a963ba203357891814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to distribute malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=android+studio+undo+delete+file PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cdff1d2c9---jafuxerakutodorefejiw.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/83291958359.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e881ab9a15---wetosubawiravo.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/wavikorexekosuzujonupepe.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109230610065019.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a939f030c---46162970636.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/23906400024.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/wotofiwi.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/punoxufusemiwokixufokuz.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/92329890856.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/96179762356.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/gakuzavawe.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/gixawemix.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/90753090325.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/fexovepi.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/sezomivedelaxusebegusa.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/ledijanux.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/83562223140.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/17530998264.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/mazur.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144791b7cc12---xazepidatezile.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141420103915---91691263840.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/labazubawopi.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/posufonesusepiv.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/fufalotoja.pdfIn PDF document text
    • 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_off0000ba8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 10268 bytes
SHA-256: a6f41798a4f93ad166106cad2dd7ba86a9fbb8505b509423cb3d297e836d055f
font_02_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 18020 bytes
SHA-256: 461ee0fbcf5754192fa7a31ed6e29e43b37406ff8c5fc20d82755f3e7b90fabc

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