Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f60edeef23569c7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 05:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c03687c95fd9abc27f019faf1c034064 SHA-1: f913bce1266ee529d0c2b748477dbdbfa46908be SHA-256: 4f60edeef23569c78fffa8feae22e812aa90bc2a0ed8b5e05d84e008f746b3f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, many of which are likely compromised or disposable, suggesting an attempt to obscure the ultimate destination or distribute payloads. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/wajuririsumosi.pdf In PDF document text
    • http://gkz-crimea.ru/userfiles/file/saxipigepasezenijafu.pdfIn PDF document text
    • http://planbmedia.hu/files/mukebar.pdfIn PDF document text
    • http://metabolit.ru/files/file/83670579750.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/luxonawine.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/18128672184.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/47733520498.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/15221555620.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/89852531716.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/43499373661.pdfIn PDF document text
    • http://toroisg.com/public/images/files/9750060911.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/ximedotukodanevojonufexok.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5df9a57e---45344452892.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161307457e997e---revatazitijususevezevus.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/xukanedogobo.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/migomigaganuvobuxi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/46971332332.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/39479126090.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/lisavemosi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7432ed016659129018a37b528b18a93c/75139673375.pdfIn PDF document text
    • https://fivetc.net/uploads/files/xekinuzebunom.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210907_3_52_14.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/bixawukivazexokeboz.pdfIn PDF document text
    • http://iviltra.lt/images/files/60981365000.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/89030deb0adfd2481ae80fd697e10aec/1561663076.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/sarelebakokonorosakemat.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/47970870018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=samsung+galaxy+ace+3+case+amazonPDF 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10904 bytes
SHA-256: b58ed292e78dbb8b191e7946af636a08854e97fe1b5334abdedc427a077c2abc
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 16820 bytes
SHA-256: 5a13628a64b15f761622a43ced79ede2e8c33dff454ff200f085de7ce86807b2
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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