Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c50107784fa0c5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 13:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d505e9361d911cf2c861293f8edfe0d7 SHA-1: aa20fe9c4ad6db329db9c8b89f8f16f8e7a12c67 SHA-256: e3c50107784fa0c59760a1db1b68ca3192f2bc7c9df1eff1876117b4fcadc3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lblussana.it/images/file/9306204975.pdf In PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/84908508070.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/rabidusuzamulexufu.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/xovadinexazijagopetituxe.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/71672812740.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/73792759211.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/654g6ulf19nm6ndtkqknmpgou5/woworiwizujuwupiwizepilum.pdfIn PDF document text
    • http://toroisg.com/public/images/files/62389802131.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/62771238184.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905030543851875.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/73671593412.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357e38625fd---39436179502.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/zulatapakerapudo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1cb9b199b4498c53dbcdc35529ab065e/33781160597.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/nizufe.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/taluzo.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/pifufig.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/gelas.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/850c68121796666447520db8dccf405c/69863596056.pdfIn PDF document text
    • https://pellevah.com/upload/files/todot.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/jalopudilipurozodal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tamilyogi+fm+ccPDF 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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 10156 bytes
SHA-256: 143110269ccf41736b086731436c80428f425e374b7bbae899859ebd56ea4d44
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 17144 bytes
SHA-256: 5b96cd9c8739da7aa7ac8acba601b596bff580b857541e5e9496f8f7382aa0b1
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1