Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b2c568d3c79117…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 20:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f62e003d94a808003d0f77d6e78d2ccd SHA-1: 8ec3b6fa3b843476ca572472d8a94d46fcecc790 SHA-256: 15b2c568d3c791173adcf9f0bd4103d7850cc8ea51df18f023ce92fe53504b46
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sns.hu/_user/file/48205589107.pdf In PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/xotedulefowobojixo.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/3327158080.pdfIn PDF document text
    • http://prosquash.by/data/87921583853.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/jizireluj.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833aece5cb2---funurogopavuxopo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100b9ab52574---jegosegogorekum.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/62153667466.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075081a9b330---49654186206.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d2e2f9ac---fituj.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/26440898805.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ddf5ad8e9c2b20294641389db3bfd15/wazera.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2446aa0c901f6c5230ba5bb2eca67f06/xenefetawovuru.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/mesikipexeba.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/56808019882.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a1e1976c---xitavowutinokeviba.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d6457404670---mobuwadigibedubup.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/vkh038h18cl6kklrmpood8fb17/83227766716.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006c79e4247---jowivozafojifutolisu.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/dedazisupafosale.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/10853630905.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/76512003964.pdfIn PDF document text
    • http://sdds.be/userfiles/file/15905430673.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/jejojixij.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210819083326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=geometria+y+trigonometria+baldor+pdf+descargarPDF 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_off0000bd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9A 11256 bytes
SHA-256: c055ba495394616b171ca67eb5b09be1d92ba6c483eae5a79911527d49e40644
font_01_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 17912 bytes
SHA-256: 399c4f07c957039c14de227253b5cbacd53f0b94645a934df293355ee132f7cd
font_02_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1