Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a932bece6923de…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 14:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b000ab709a499f1b8697ca37bf935ff SHA-1: abc8a6e6e3cc8d8f0faa2ed3fbe50243dd8683a8 SHA-256: 33a932bece6923de658a1b5a7dfa26f2099baee9c6ebe1ad3cbab529eaa6398e
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS uploads or disposable hosting, indicating a malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing a fake browser extension or update. The embedded JavaScript likely facilitates this by initiating the download or execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://dakhoanhanai.com/images/files/bopabivu.pdf
    • https://godahoian.com/app/webroot/upload/files/47934377257.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/ganelebotilejedisefijez.pdf
    • http://capmar.eu/userfiles/file/62775165708.pdf
    • http://zespolbahamas.pl/zdjecia/file/57283891716.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/27316919544.pdf
    • http://xn--80aa5alfu.kz/file/donepobi.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f66b1ef1---dexudidumiri.pdf
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/raxodori.pdf
    • https://casabresciani.it/uploads/file/nudenavuwoneze.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f790efed08b7db14333f558870b71de7/movowenowiwag.pdf
    • http://jezirka-biobazeny.cz/UserFiles/File/2444556847.pdf
    • https://abzesolar.com/uploads/files/leretozugin.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/26496330834.pdf
    • http://vhktn.at/images/content/files/60915852139.pdf
    • http://ontis.sk/editor_uploads/system/files/52803731874.pdf
    • http://mtsskzy.com/userfiles/file/22680369163.pdf
    • http://techcessgroups.com/userfiles/file/52104376850.pdf
    • http://e-skala.pl/userfiles/file/gitaxeramikalika.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2f893340a02c7939de89eab6b174d68f/dajusuzibinonazuxavixew.pdf
    • http://stefanourso.com/public/userfiles/file/xunululurabeguxetoxepu.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2885c2d1228010133595d5e9ed82b796/31186812213.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/zozalezagejivetapagusefub.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/61206511990.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd4422d0b---61153191719.pdf
    • http://dongduong.net/Images_upload/files/91220497787.pdf
    • http://samurairamenbar.com/uploads/files/17125153927.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=easy+way+to+transfer+photos+from+android+to+iphone
    • 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_off0000de18.bin
f69ce435d2fb1d99a687cacf24eb7564190b9061e5ad49b4c79672dbbdc37e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10900 bytes
font_01_sfnt_off0000f72f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 16792 bytes
font_02_sfnt_off00010f41.bin
59348b7daae951c8e3ecdfb3d7516ac64273037f25761ab0f6d094aa62f4b5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 17796 bytes

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