Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e75b11c107bc86…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 14:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79133b24627dbe0d851a21537a358a32 SHA-1: b0af38288fcccb0cc855232c18bde47420e58d2d SHA-256: 54e75b11c107bc86a0711e4d60cc042eaa7402289f2ef0dde26abd902e656ecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of a link farm is a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16123750c8dce8---25282693943.pdf In PDF document text
    • http://baovekhucongnghiep.com/upload/files/70822035442.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/mukibusu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8n9bq0pok3salu8rpedthau203/95261958798.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b6aba9fea74cdce6c1342dcaf1f19646/27778741551.pdfIn PDF document text
    • http://torgoborud.org/images/file/45591892297.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rl9g7kchsi8bbub80262he5pi0/40979975384.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f772ea50---bafafe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0fa084e9---80642572292.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/90996325361.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/87379974872.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/7351703379.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/74598256146.pdfIn PDF document text
    • http://partnercable.hu/files/reforibe.pdfIn PDF document text
    • http://halaljones.com/uploads/files/89374329666.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bb76a62b5---58511750104.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/pakon.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dixiboxenaxezitefudi.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/65246976158.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/86277666875.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/75667309118.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/xijanunirujepijesu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428125420172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mon+livre+de+fran%C3%A7ais+4+ann%C3%A9e+moyenne+pdfPDF 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_off0000b3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 11164 bytes
SHA-256: 3548d53d3f9af62f402bc182075f11d9028602909d4714fed0efbc1665daa0f5
font_02_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 15912 bytes
SHA-256: e555861f2b640bae143feec55503809ca92b947a055a2d380e938541e5b45ca2

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