Malicious PDF — malware analysis report

Static analysis result for SHA-256 412b39acdad6928c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 17:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58e7debdc2da6e797a9c225406ca7cd3 SHA-1: a3c724c8938ace344db24946bc66c088ad48088c SHA-256: 412b39acdad6928c1212cf70507e01d47a23923fb0a020a08eb5f5bf566c0c99
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to redirect users. The ML_NYX_PDF_MALICIOUS heuristic with a high score and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161339bcc8dadb---62337109201.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/juruxugibanadozamerakop.pdfIn PDF document text
    • https://edgecs.com/documents/wagefavomamekasofoziwoz.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/guloteponivur.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1i3ae94210ajsvahgk1sri7jk0/41707567473.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/2634150108.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/13885417605.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/67205307097.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/rugurakajizawipixane.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/83450662429.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nosakeladasiloninipala.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/60306168943.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/gisegakul.pdfIn PDF document text
    • https://tpk-m.ru/files/file/depexalegejijajed.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/duqnne210s6p7fj692ap8me83j/99890594176.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/1418751330.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/27571686544.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/27448287760.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fofazesimusitejoxixetotuj.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/66053288016.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/morukabezi.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/bunowolotixulikomusepir.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0efe6620ffa912118cfbcbd4ca0ad8d8/25704930797.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zitekaxorivilujovon.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/jepapivosizaj.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/45069229334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+shooting+games+listPDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 17284 bytes
SHA-256: ce5d606f5447c1ba32df995beb8fccad6f5255c4dbc541cb7c23df173f8d2446
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 10508 bytes
SHA-256: e0c4ae7f8311298d90704e8f463b0b1c86818222fa5ce4698eac4193c316662e