Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f509b494b402049…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 01:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5f944de5f1989ab4d5a06a831a7b94f6 SHA-1: 05c208b840c76c3727b6e36e264197dc450193da SHA-256: 5f509b494b402049918ade5d9d424b363f39fa3e24fb63f0751e83a0a7269067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing pages or download further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://ketchas.ru/uplcv?utm_term=how+to+make+a+server+in+unturned+2020 PDF link annotation
    • http://www.alexgis.com/siteuploads/editorimg/file/vowov.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f775d9d868---gonaganofizodaj.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607189ee68dfc---77857323349.pdfIn PDF document text
    • http://melvin.cz/data/66217101046.pdfIn PDF document text
    • http://askaudit.ru/price/wovojotu.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/45225249664.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062016430890.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/34355735613.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/tibuxidita.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/90160062053.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6892b7a78b7898907318717ebcd1c585/nivoganizitiniw.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/40623339314.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/basim.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8648b382e---penukojosimera.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085227fae8ac---zikaxuvemexi.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/sirozikofodafupixe.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1b8d0f6966b3814a6637790de16cd26b/70984358515.pdfIn PDF document text
    • http://landpas.pl/upload/file/69784155801.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/a9e0f01a3254d3812d98b61599b3ed03/45720843847.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210628165201.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/xerevevewulanurubekuwu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/68373936345.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/gikokuf.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31494d5a8b---fazope.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/13010359926.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9b729d82---67442229970.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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 17820 bytes
SHA-256: 4b18581813c1166194f9d5cbe457f345b9e2c4ea02f6472efdc9be95dfaf0550
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 10940 bytes
SHA-256: 92a4a1ff131d3b5f25583262c8847028ea400554bf77da039d425728c7f423ec
font_02_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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