Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55085f586a762a5…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 01:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c3e3999247ae1420681c7eec489e71f SHA-1: f254ac12369286eef0b03b584bc6f720bb4b99ee SHA-256: e55085f586a762a555def93f9a8a557549233ed0d53452846ad319b6a435677a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm indicators strongly points towards a malicious intent to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inprovitmexico.com/ckfinder/userfiles/files/72084990301.pdf In PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/jenogagujezakizidera.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/4186817271.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/37544525412.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/16669584412.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/53107283636.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/mifomuro.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c372b6a202---30830531953.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/bixanolebulurato.pdfIn PDF document text
    • https://betsin.org/userfiles/files/jamapefufareruto.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/19385937885.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/rupatogawegoximitub.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/13769308737.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vabonuvenatabe.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/15958641065.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/11567292692.pdfIn PDF document text
    • http://ahchala.com/img/file/74515523669.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137288e457ba---86499677735.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/78808802863.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b98f46ef3---jiwojotapawuturuga.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/patid.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/gawejobebabapeju.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0b148a3d120912331f1975cc6456a12c/minifowuzakakugob.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/jubeniwizutimujuwideg.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/serosabozuzimibesugurat.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a1342fd24373384ba374098dc87a426a/4295801092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=poker+online+mod+apkPDF 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_off0000b6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F8 16508 bytes
SHA-256: d0af0d0792566110d9edeaa3c64df0c271fba91ef2a7b84528ce69873a81a1ef
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 10380 bytes
SHA-256: a456ce036b79d51e820bc6fac3a91fc0c44ff8321dddc73882f96d109a00ed88
font_02_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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