Malicious PDF — malware analysis report

Static analysis result for SHA-256 142ce0dfa369a433…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 00:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 319b94694ccf9b885be47c29369acfd8 SHA-1: 22c1c0e6679d07dbec648b43b57252b333035856 SHA-256: 142ce0dfa369a433d2e029f771297b382b51f3bea9aef0c352d3282da7e12d04
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. No scripts were extracted, but the primary attack pattern appears to be the distribution of malicious links, potentially leading to further exploitation or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://synerhu.ru/uplcv?utm_term=cara+membuat+wechat+di+android
    • http://phanphoiongnhuahoasen.vn/upload/files/68213964232.pdf
    • http://kleinschadenexpert.com/userfiles/file/59272728468.pdf
    • http://anquocrealty.com/uploads/image/files/97771588977.pdf
    • http://aldo-ins.com/userfiles/file/nogupamidok.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc380240e9---lobojanaxone.pdf
    • https://mantyobras.com/userfiles/file/suvupusulixukitonenaxezik.pdf
    • https://alpinashop.bg/files/2089225277.pdf
    • https://grupa-energia.pl/attachments/file/13712360988.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d295e318d---gizuvasutujasubaketadopi.pdf
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/towerunidomu.pdf
    • https://swapnauraan.com/ckfinder/userfiles/files/76656314321.pdf
    • https://togelunited4d.com/contents/files/ridoteto.pdf
    • http://peaceinsrilanka.lk/userfiles/file/gowizenibediwuxedepuro.pdf
    • http://at2apigroup3.com/contents/files/54794834327.pdf
    • http://domainecomps.com/documents/files/12170097360.pdf
    • http://kxxbs.com/uploadfiles/file/a/65083748144.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/7463202991.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/tigezegetijepute.pdf
    • http://nacyc.jp/Upload/file/22226470552.pdf
    • http://st03.it/userfiles/files/71049456296.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/94073668806.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/56818397952.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/86602231488.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8fe787b6424a450e3af7d6b96a6aaf85/sidudegirediwubujufetad.pdf
    • https://discovery99.com/userfiles/file/migemageberofelak.pdf
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/17515519344.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d894.bin
335a434664b8882f9b999b396df7af3f1776aa98eb5a63263a9434a9518709ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 16272 bytes
font_01_sfnt_off00010307.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16792 bytes
font_02_sfnt_off00011b1e.bin
fc31c8c0ffac26cfdff5d81f9887183cd62ef37a76c3f9dd061b4897256901a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 10776 bytes

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