Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6baaf02c629296…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 04:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41f11b6af7986efcf56072380dac80ec SHA-1: 49fc26c404d0805a62c26d84927b0bd53bc17553 SHA-256: 8b6baaf02c6292969557749a01dc228b8f3210d2fad8c110ccd5938797df4e60
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or exploitation, while the link farm serves as a mechanism to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • 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://thamcohoaian.com/webroot/img/files/zenosivefolijigufol.pdf
    • http://vasekurzy.cz/userfiles/file/86448521925.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459cb3e4089---38442561617.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98af817f7---lojijipi.pdf
    • http://tetraeng.it/userfiles/files/31168014911.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/nataxulezubojapasuribuja.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bezavu.pdf
    • http://protetyka-lublin.com/images/wyswig_images/file/wixepikefu.pdf
    • https://condicionamentofisico.com/arquivos/file/23561443078.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/65064272772.pdf
    • https://senfina.top/uploads/files/90625816250.pdf
    • http://najlepsietorty.sk/uploads/fck/file/jiraz.pdf
    • http://artdealer.vn/upload/fckimagesfile/0b84ec48eca8ec2ab540cfb169ae787d.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/xokefipul.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/kuxobisugituvuda.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/xalupaselerimatetor.pdf
    • http://hengfengpaper.com/filespath/files/20210921160456.pdf
    • https://hkpefa.org/editor_upload/file/koxitilelat.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16153e1c7855ff---kalokik.pdf
    • https://basisnomor.com/contents/files/nitidaf.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161475120c7fe5---sipaseludumapitetatakel.pdf
    • http://thuexe7cho.vn/upload/files/vekofefizilej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+rom+for+galaxy+note+3
    • 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_off0000adf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADF6 16792 bytes
font_01_sfnt_off0000c608.bin
0322e4a52bf130ac576a9b353e3a9ae15e5d6538d1050196a45981455abe9751		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC608 15032 bytes
font_02_sfnt_off0000ebca.bin
76031f183c4a6346652e02089182b5d07dbd496a7835488727c15f8e448c5a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 10904 bytes

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