Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc959210e5f61361…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 16:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2c694f475b680b86317310825008336 SHA-1: 217f314a98098ab682c8bb7739e1ce7e8fdfb0b0 SHA-256: dc959210e5f6136110282d3e7340ef79f35c2801e57bc9221f3bd680d4574168
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm designed to trick users into downloading files, with specific lures for browser extension installations. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, likely serving as part of the distribution chain for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pincailight.com/zk/UploadFile/file/2021062219285373499.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4f40b0d9---vujunijadadina.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/581bd2d44c55e43f69589de190012139/76483248120.pdf
    • http://lateonsettay-sachs.org/userfiles/file/pugilituluwupumo.pdf
    • http://interface-referencement.com/userfiles/file/fakim.pdf
    • https://arrayamed.com/userfiles/file/xibumeb.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607978402f603---60270529093.pdf
    • https://geniodelweb.com/file/lutuvodafor.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085593cd9a4a---kufodevagifevoletugejib.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b0a6aae3---91263078366.pdf
    • https://abofahed.com/userfiles/file/15822401308.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/levide.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5l4o1i090nv4ugt01d14uee54a/figeboporupufo.pdf
    • https://btegypt.com/file/47479292814.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/jifovakijeluwenofuna.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c0b54ed7---85039431529.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/872fd31205b1110616bbdb77a1466635/72700024006.pdf
    • https://anthonygillant.com/userfiles/file/24718331641.pdf
    • https://medtek.vn/storage/file/turogagepogazifivokadukap.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a77273ae---85499230840.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/88tgfpk6gsb5r5ha7pm14acl00/mutokavumaw.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b9e1d91c---siwetudel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+xxnx+vidoes
    • 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_off0000d815.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16792 bytes
font_01_sfnt_off0000f02c.bin
7ae8aa05b23b468eda86c1c2e7fcd94d7cceaf78dfa5b1235c49696c55d2e24d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10300 bytes
font_02_sfnt_off00010782.bin
49aec213b978b74f5b9bafb2e30bc7d9544fd23332cc1b3a970e097505ff72b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 17016 bytes

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