Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee0ca394e01ffeb…

MALICIOUS

PDF

71.5 KB Created: 2021-08-31 22:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 124c87d3bd167d49256b1f8a2480010d SHA-1: fff9b9c818a9b6cc922a4c722b0f648a58bc4d77 SHA-256: 5ee0ca394e01ffebf0263f32b8fbed0abad0223ca82f1c63d00721561f1dd04f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://chcial.ru/uplcv?utm_term=excitons+in+nanoscale+systems PDF link annotation
    • http://skupka23.ru/upload/m/58166755899.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/57417495757.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/47078481131.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/bitasikejikax.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078922844e51---xegubasogetowujodemu.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/dupegasilubegezimexitox.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160833e15a8257---88204093447.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/nigat.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f5243587b---89829966722.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902495b8774---fepawasavavabemovotam.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ju6r33eiif0okb033hajcjn0q4/vawinorupivikeno.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087158d9228f---86378940204.pdfIn PDF document text
    • https://cristalensi.com/public/File/26734348483.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5216e08f0---volejita.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/17953246177.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xolosomif.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/86eoc2bafrk71e27pbfmb42tc5/44306799244.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/84107161168.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828729e301a---jekerejo.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/mexigujawufekepubizorixi.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/tavilemavunidiworasujuk.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rasawobomawesupirumokobof.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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 10488 bytes
SHA-256: 824abe134f1fe4a414500468e616826c8f18f89548e202dba48c3cbe013be725
font_02_sfnt_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 16292 bytes
SHA-256: f6a005181504253654b081a9fc6c4345605ead71f684bb128e5317bd7547a84b

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