Malicious PDF — malware analysis report

Static analysis result for SHA-256 44617b84bd0a34a8…

MALICIOUS

PDF

86.2 KB Created: 2021-08-21 03:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e440b6582edacc233cbfbee49ae8f5df SHA-1: aba53ae9ff67344e27880f00a1bf6cea5687a189 SHA-256: 44617b84bd0a34a8ecf3fb36f32ad0c09acb5c1bb9af2ec7a1a49c3db88493aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://local-minicab.com/survey/userfiles/files/kelujetuxewujexijikuv.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/u0oq4dmol6i2c3t09ahm4t4er1/koxebufuwukul.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4bgdp3ampf50utujphtu1og9h6/kemabukesaxafibofagu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ing1bh15l48l2u7gb8su3fc1ug/fufexipekaturalipapaxezop.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/jetawagigevurifofup.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/gowijiwidupeluniro.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/zemef.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/judisesos.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/kumafixemitobuzofugimuji.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607038203f2e5---45349039144.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/tujamulelonase.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/megok.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d564ae42e3---malorupogigonobokijir.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/51164965062.pdfIn PDF document text
    • http://jngf.cn/files/file/88063962119.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610809fd31c4d---pevodeb.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/vabemu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722590a0cba---nuposobirusidiragunasef.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160982bc5698e0---5210307703.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/rutaramamuput.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/67778887743.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4dd86fda2---25636388878.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/senevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bose+soundlink+colour+software+updatePDF 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_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10944 bytes
SHA-256: e615d657b7c0c2d7d6bb845ab75d2e7f6d26f2e6952399c1d04ca0fe46fa8f15
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 19588 bytes
SHA-256: 4bd2eaed0964cfafb2fd0ec10fc0375afc31b31a393c24c0e4728bb0e28a6d1c

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