Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe018ee174c54a1…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 06:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddf72c28fcce45d3d42aca8bf46c8d56 SHA-1: 5ae672b9050ac556c2eb8286d22c70639574e3d6 SHA-256: 0fe018ee174c54a1d7bdf86d0087c9904da5cf21d4e4010ec3530a72388e9208
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF's primary purpose is to redirect users to malicious or phishing content, likely as a spearphishing attachment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/setizopiwemurevokov.pdf In PDF document text
    • https://cubic.is/userfiles/file/kojolirawunamul.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/lebizadepigedogosatupa.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/memazosobajep.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/pivuvamesatupefekuz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0l074pfr4q2go7pvp973ooue1/weditolipoba.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/venepukovorekitokatav.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/76246405895.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/96941849333.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138609cf12ef---jaxamuwu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/76770272037.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/68076922327.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375a1655d63---sawax.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/94571981899.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/durapimala.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/xegaxojojivinilan.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/lojizape.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/19396004565.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/51052265499.pdfIn PDF document text
    • http://etkenkalip.com/files/sujatiwovazajazaxib.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/53867189321.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/30078794661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=action+hero+biju+watch+online+with+english+subtitlesPDF 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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 18636 bytes
SHA-256: 86860b546e71febd59fdfb269ad003b44fc4a846d1ec06f7069f816867f6be46
font_01_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 10944 bytes
SHA-256: 48e8727e7955e2732522277c8f07a6ed0f8921dd5f0734e4815272e9570b3c68
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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