Malicious PDF — malware analysis report

Static analysis result for SHA-256 3720d4c67027b574…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 01:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5d4f511bd27ffefd0e912353f049fd3 SHA-1: d24fd5750cf3959234be0e3e38284b94e0b6c392 SHA-256: 3720d4c67027b574454f8421602bdc37ab041c2772f8cdb2e1792919292f566d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to prompt the user to execute a command, a common technique for downloading and running further malicious content. While no scripts were directly extracted, the ML classifier and the nature of the heuristics strongly suggest a malicious intent to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://club-integra.ru/userfiles/file/fegovu.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4de4325e---55385792863.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210731085013.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/rajezaviwemedabirudukoki.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67aab1a79---70923379752.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/21819813102.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f7a3ed8d---kixalawabogubev.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/6564656659.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160824e14358e2---zupinotunaguweva.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/96646811795.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lanudojugujatudetijezuguk.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/55808868647.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/23544810805.pdfIn PDF document text
    • https://goodline.by/userfiles/file/veriwulemadumumurosixa.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/zofejobaju.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/46310042802.pdfIn PDF document text
    • http://vucert.vn/uploads/files/93987757452.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f0548cf12---80292227405.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/metedejekutovapanetaka.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/4732191134.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5go5csvihsraf4v7v446g7moi0/51832265524.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/31069837524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pip+uninstall+manuallyPDF 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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 10276 bytes
SHA-256: 4f73fa0cecd08f68bb7b52979a99573f25951bf8248ea7abdc9e6d4de10ae94e
font_02_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 18328 bytes
SHA-256: 4c0ce2eed1f7c5125217928dd22371bfd2828e53cad3623456b779a6f9234628

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