Malicious PDF — malware analysis report

Static analysis result for SHA-256 64da6337f69d0fbe…

MALICIOUS

PDF

67.3 KB Created: 2021-10-04 00:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae5f8922f531117408f6976241b25e2d SHA-1: 98d194438d43dc5bfdd03ac09589bcb41ea22aa9 SHA-256: 64da6337f69d0fbe478a6433d548fa643daeda2fea77a1bb10ff8e88aaec802d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a screenshot lure, typical for phishing campaigns. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly indicates malicious intent, and the structure points towards a user execution attack via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://thietbiantoanttk.com/uploads/files/61915167532.pdf
    • http://geometrarontani.it/userfiles/files/jasijugumolelaxuwekujiwiw.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/43479365652.pdf
    • http://kdbelektrotechniek.nl/uploads/file/jagojiridekosusobesupi.pdf
    • http://curry-box-deluxe.de/userfiles/file/19205872478.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4005804a---xexin.pdf
    • http://lokalsport.no/userfiles/file/89922222358.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/wizepoxiwatebemovugox.pdf
    • http://inbiosa.eu/static/cfiles/files/wedogebotite.pdf
    • http://dj-maily.com/uploads/pages/files/vorirat.pdf
    • http://silver.jo/ckfinder/blanc/files/mijela.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/73701622842.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4e9934ce2---40337539528.pdf
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/menenapugojududov.pdf
    • http://gdgom.com/upload/file/210918155314491886iopzs7p0g0c1.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150615727ace---buwefidefo.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ec7c1c3cf---tukejazewoligetama.pdf
    • http://karlsbach.de/userfiles/files/89720597784.pdf
    • http://pjcwyy.com/upload/file/sojapifenuvufevosatoxid.pdf
    • http://vngo-cc.vn/cooker/public/files/89217289497.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/zikusotosinumo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=valley+strong+credit+union
    • 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_off0000acde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACDE 16792 bytes
font_01_sfnt_off0000c4f0.bin
3eb57ca6a81bd5fe3598d9bbe8f6b621c392f21662ade7b601d5474df515f3b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 13924 bytes
font_02_sfnt_off0000e7a4.bin
5963c8aaef600da3e2e8e0d4184a8edf1c5159dd1a4f65220d2845d783727797		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 10728 bytes

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