Malicious PDF — malware analysis report

Static analysis result for SHA-256 8989bca913986bb2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 04:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1903f56d53469bf8208220aac6b0fd0 SHA-1: d97bfc99b99d4af8d37c53594719deb03e4ec98c SHA-256: 8989bca913986bb2c925495232c826d6ec9fee7249a11e5a76bae29fd316cdaf
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing a browser extension or update. The embedded JavaScript likely facilitates this lure by dynamically loading content or redirecting the user to malicious sites, ultimately aiming to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://wastran.ru/uplcv?utm_term=add+more+shortcuts+to+chrome PDF link annotation
    • https://arerp.kr/data/file///42887511961.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/wufufakunofin.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/28828147668.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/jisikojalirowimam.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/bajoxugulujozidoxejakeke.pdfIn PDF document text
    • http://gespk.com/userfiles/file/72107617248.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134c38347d1f---wipurumuwutote.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36145fc20---raxegezazazokefox.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/71000878114.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wuxefutabupanixaxolip.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/33823995564.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/42060450431.pdfIn PDF document text
    • http://scarpatti.com/files/10932322861.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/nufexopigar.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/86132924540.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/bupikuzalukisamanavadana.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/dekesikegetagonirapafi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/53834510361.pdfIn PDF document text
    • http://protok.pro/upload/files/69976977001.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/gojebemugubuvireduk.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161309f7e68b0b---zegixizufepirabexegadu.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/wajapegazikevevipag.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/14434508289.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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 18400 bytes
SHA-256: 238e8fdac9d6bf155f898b68ac7e51ad940fff441129343008bd81c3c12d8bf8
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10312 bytes
SHA-256: b4b6071795e03d6eddf19e2a6f947814c79cb1b44c4d6b09e5f83f024ea21170
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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