Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca56b549e039f81…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 08:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4eabf1de499fec7546e811e3a9155c92 SHA-1: 23893d096aedf7c1f593575cf64bda1044584769 SHA-256: 4ca56b549e039f81b058ca6d2f099356d22b412fb43e483c3a379f66a3da3e10
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eros-arena-reutlingen.de/eros/userfiles/file/49402424588.pdf In PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/64d306b0a0e66b8651844752b09e3dbc/37351441978.pdfIn PDF document text
    • https://totounited.com/contents//files/lakakumubu.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/5391259957.pdfIn PDF document text
    • http://premium-t.info/files/files/24933197222.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/mumogixoxebedejinanot.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/8994299800.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/xoxanawamed.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/66261923568.pdfIn PDF document text
    • http://agama-rc.com/upload/files/babololexipeli.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfd8adf8c6e5f09bc7bba31a0b473642/68277487266.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/3842862042.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f10d6866fe809116bf092eb9ec0e3ff6/59910220344.pdfIn PDF document text
    • https://nevisnews.com/userfiles/bebijem.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085054cca245---41991674421.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/kigek.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0234620f0---xopesalowirisaful.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/le4vsmvk43s21gvn48uru950d6/xupinimoturofazigewamov.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/22524246267.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/65195486257.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6452a17265---tozilefu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6d049839---muzuzijufamovigotujorola.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/14923730202.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/85539146348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=conjunction+and+linking+words+exercises+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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16456 bytes
SHA-256: 41c7587aba3469a68aa8e4459c04ca39d94f0eafb44bafc0626b9cbb90b82273
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 11336 bytes
SHA-256: db8febfea88284538fd4a50243ef6d03bf148e9a82f389d806aa1712d6a16da3