Malicious PDF — malware analysis report

Static analysis result for SHA-256 a708da94682f4373…

MALICIOUS

PDF

249.4 KB Created: 2021-08-02 21:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 89461975c739c77898f1baacf33bc389 SHA-1: db10a806c806103062e480429d16216679699c43 SHA-256: a708da94682f43731cfb89d0c6234b628a2e61712fd234bca6a238c5cee31cc8
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised WordPress uploads and a high ML classifier score. The document also employs social engineering tactics by instructing the user to enable macros or editing, and presents a visual download button. These elements suggest the file is designed to trick users into downloading further malicious content, likely a Trojan as indicated by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8388

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://luingpyrex.cz/foto/Image/file/titaxawanise.pdf In PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/40eb38d86a0fea4647cff8db1fa50489/6763507785.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086978d3c600---vibugonumenorakatimat.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ff5d556da34d08b048315270a82cd36e/tepatejeweputuzoris.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/78602950712.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/powokawedupumizasazevake.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/88157885656.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e48381f3627---vosagamugarukomixibar.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/g6bf1h0vsajeikejf68enofks4/pogotiri.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/tikesarala.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/29659068252.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f4b07673ee89a4b91a2db270f4161cc7/62103316394.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b390cf796---sunobixetesagozis.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c5b039dc7---75802852026.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/5434194159.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32f3543025---17608744878.pdfIn PDF document text
    • https://isleo.com/i_photos/file/vewetumurokuralegop.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/93823712528.pdfIn PDF document text
    • http://oodow.cn/upload/file/210702061401918985nxmgdmspm865.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/64108259262.pdfIn PDF document text
    • http://yejida.com/userfiles/file/mowedulosijumevap.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80fe18367---58328208873.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa13ba6e64---85658081755.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/23074113006.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/78393249034.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/79cfbdad7c09cea2041830a5f3bf9b7d/guginewixud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=igcse+computer+studies+revision+notes+pdfPDF 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_off00037082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37082 19056 bytes
SHA-256: a825fb70462e0a1ecc26888f6244b8984edbd25fd1b2306afce06eba28910682
font_01_sfnt_off0003a362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003bb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BB7E 10872 bytes
SHA-256: 0713062e37a0d62168baeaa8a4e5a8f1652b86d49f8084ff5939ad7bbcc729e4

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