Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e239eb48bc41357…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 09:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 347b4d526b0d4d8758330243c313b612 SHA-1: a559cacd1a90f5fd9af533858b206bfb09fdfcb2 SHA-256: 2e239eb48bc41357dfb5cbb60baf6d0ddd495f8cdaaf9daa098c0b3c512884a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate the document is designed as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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://fujieshubao.com/zk/UploadFile/file/2021091118163173499.pdf In PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/bilakazafugerowukax.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/73311726975.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/34533318343.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/15762887417.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/32511769418.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef79cbf3---47313106840.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/106140567.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/bexudebuwi.pdfIn PDF document text
    • http://poorclarescork.ie/images/juzigexazezanumogex.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/rarijutekijo.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/7220239900.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kblh8amad0hu3qvi323jb88og6/tirubopebugekoxake.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109020950118420.pdfIn PDF document text
    • https://svltv.in/userfiles/files/84032240260.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sabakelikebebadofasugu.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/21846951136.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210921115638.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/libadelogamavutipur.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d0bc49d04---70371124153.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e9ba2922---logilesej.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/69306503349.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/73726185114.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/66959699381.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/82415339438.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/31648738287.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/58376021000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cadillac+and+dinosaur+apkPDF 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_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 20044 bytes
SHA-256: 3f633ff8c0d61ace0d9b6a6c9cb19737b18cdcf26b959b011fd9d33dea1c775f
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10500 bytes
SHA-256: bc53c196efbaf683e648178a0f80e956c9900567f126d40faef0d7ba15837329
font_02_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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