Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe19b5f51db7fb5…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 06:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 06f7fb77a828e0505b37137ac8933999 SHA-1: fecb90ef6c4da0572ded4fb47c22423ae79f53bb SHA-256: efe19b5f51db7fb5b170d2a48a2db7d997eced1eb44cb72f9c947dcb5be4d790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ellenia3.eu/userfiles/files/25295338836.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/atdndaj8beniu4i1onndih75u7/81231774483.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9e29a67---62434755190.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/68752830513.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/1747210685.pdfIn PDF document text
    • https://krossi.ru/images/content/files/papivaxuwetigezotetilaz.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa13ce82b---pedesiroweboxiluzutoleka.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/negajapi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161072d066fdac---wipufola.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kavevabimumikega.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a035ae30ccd---44992171617.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/tavuliloximesawupa.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ace63fb1---soginetabudon.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/uvhe7pifr7t3orbp5v6ks3b196/82174848986.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107310036143980.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073177059320---fedaliw.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/dipusomopuwupulavevelelob.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084137c76f76---kofaforizuxelixo.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/fofalolu.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/zadagusenujafetolukilunek.pdfIn PDF document text
    • https://rcot.org/userfiles/file/vuwaxow.pdfIn PDF document text
    • http://devison-matras.com/upload/file/16896972135.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e50a4f05---853396046.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/63288156906.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/kipebemuwumuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cooperative+communications+hardware+channel+and+phy+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 11284 bytes
SHA-256: 720d8bea431c69acbe7317819dc2a2e0a45bf75950ddbb24d3b0b81bb2f2662a
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 21304 bytes
SHA-256: 044cda7919589ebab3a25674155e12524b18b4963a2cd17635f9ae2a486800d0
font_03_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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