Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e65bc4b98714b13…

MALICIOUS

PDF

76.1 KB Created: 2021-10-10 07:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb6e79ec4d5d92108967677a1cf8157c SHA-1: 06704cf85bd199d8308ffc0e58a513a470903670 SHA-256: 4e65bc4b98714b135921c032c643bfc6fcb80575ea31ce66c5fce4f191d983e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host phishing pages or distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to redirect users or execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=present+simple+present+continuous+ppt PDF link annotation
    • http://kiko168.com/UploadFile/file/20211005070401376.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/72363877161.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/18308193636.pdfIn PDF document text
    • https://avflash.nl/upload/files/45707259282.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/40668719027.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6ff2a4ee---gomixuwajogovunun.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143441453523---remakujigik.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/47700132197.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161537157926e3---vexenidizovu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16158a1bb1cdd9---39992980681.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/17391749731.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/bolidaxigododerul.pdfIn PDF document text
    • http://goldmustang.ru/files/files/70584151959.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/39214026179.pdfIn PDF document text
    • http://nissan.e-library.tw/uploads/files/3154374886.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/89682357431.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/23949372506.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/83320094708.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/57498832235.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/42084809642.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/26748563986.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/58358945972.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/vepapa.pdfIn PDF document text
    • 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_off0000c3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FF 18176 bytes
SHA-256: 0f885dcc94fc2522864d0393e329ba36478fd47f198fe88671c04a99ac786177
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 10472 bytes
SHA-256: 332dfb18b219dc5420d74316db87b33bb8ac8589581ebd7192291a6f210f8c76
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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