Malicious PDF — malware analysis report

Static analysis result for SHA-256 b709d1ca9c7fd04b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 06:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd48f9daff96df38326c1f5f365dbfa3 SHA-1: 6fa3f831a1f405b0e18970be548b10b19e845f3f SHA-256: b709d1ca9c7fd04bc911b6b74f99bc0defdd7b836ddc97fad342a3fb1e4aa202
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous potentially compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs, including those hosted on compromised CMS platforms, supports this assessment. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • 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 https://alkathirilaw.com/userfiles/files/zowimebobopagesavasinave.pdf In PDF document text
    • http://vinhthuan.com/upload/files/60419713136.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41944480269.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/tatidam.pdfIn PDF document text
    • http://irinabailey.com/upload/files/83951410603.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b312974fbb3a8faf99180807bd4e7250/4083377312.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2c17608ef100eaa8554db8a682c3cfc7/344931991.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161351e8551e59---nurotu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93bccfeb---74451668719.pdfIn PDF document text
    • http://rc-modeller.se/images/file///46707396811.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/peziwofuselavibob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd8c08b25---27177803956.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/vidinidixenufidoxufagega.pdfIn PDF document text
    • https://oasis-travel.ro/files/fexurexewumiwumana.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/86955238598.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/dezitosukej.pdfIn PDF document text
    • http://yejida.com/userfiles/file/57841385470.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/58270174099.pdfIn PDF document text
    • http://maksimetall.ru/files/98100492085.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bd71994f---tososuj.pdfIn PDF document text
    • http://ccsl.asia/files/41983373222.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/wulub.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/14424174119.pdfIn PDF document text
    • http://mp-journal.com/media/file/62037264688.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/gixuv.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/75623886462.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/xinotetep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=subway+surfers+hack+download+for+androidPDF 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_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 11084 bytes
SHA-256: fa5ec13da150d2c09794057db7fb5399298eef013b8da29b6934eccc9ae2464d
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 19048 bytes
SHA-256: 337503669f6384cd29e41a69bb1fd264c9530bcd76b10e5581f229ecc7138b22
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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