Malicious PDF — malware analysis report

Static analysis result for SHA-256 588f99cf5fd42be1…

MALICIOUS

PDF

88.0 KB Created: 2021-07-13 23:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8a52654750de2fa9bf38a1c3e78f8ef SHA-1: e678efe62847755948e93da5ac6e901c7f23766c SHA-256: 588f99cf5fd42be11c74707ccb80ce857858e460ff89a71f3ad9e49d65400b23
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/84dd6a45c182b394a249eb25e80b23c6/kafemuxejukimoginiwotema.pdf In PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/78421452931.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dbb0ef3119e1997fe8c8ad923eb32887/kurej.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6501a3ae---lovudufuwesiras.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078dacda1acd---vaxifapozivugisapuninase.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/9844663551.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d086cecd0---70797359788.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/du1ik20hl8usj1pcmoh75mgopr/43659072091.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nenuwonepi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d62c08b55da7c313be4aff242a0e9d04/guzogajomatididi.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/69837484463.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2836653d95---63980784959.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea508c0ab---4183931273.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210618001506_sxh6ei.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gjg9cpmsmk1h5hrg3f6g4rkafd/69398372861.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/aabad45b89c43967979209b2d001481f/soputirikij.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210529_FE7E88AC3DE60224.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82885ff00---wojidogivo.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/67826012315.pdfIn PDF document text
    • http://honda-vo.com/upload/file/62315794411.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/nipewomidovijudarotavate.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/02723b7692d0265860b0c74a6fa064f8/95899389983.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nikoredufodazaxufaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2+wire+serial+communicationPDF 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_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16960 bytes
SHA-256: a2eb09e89d8c15e6b323826993dbd6e449cd116736d92a260b1ff8b60a17e697
font_01_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 10600 bytes
SHA-256: 7aaf9d4afa788fc9d7e0c5caec6e6bc79c30de0320a16e423bc8f8f2990d7b7a

Open this report in the interactive analyzer, or submit your own file for analysis.