Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e78fc6270d285d…

MALICIOUS

PDF

72.0 KB Created: 2021-06-03 15:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 31e518639b0d8b2e59f833b084c8b374 SHA-1: ad5d37d489cf9fe365fd926e2909291624492f65 SHA-256: 81e78fc6270d285d05d97ed209fcbabdb8417331c7c9dd90c40a6fab13f9509e
154 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on compromised WordPress sites, disguised as information about sump pump batteries. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, suggesting a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

Heuristics 5

  • 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
  • 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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9986016d---10629580757.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/26204c40da5ae7c84e1fd5436b458099/79638724822.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a350fc0c088---79424897698.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081c50f5583d---xojike.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc00bccfd8---33152701839.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983446be23e---47934507520.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c242d7ec---wipefofisetomapewivelati.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8fe703c5b---liviralameguwufere.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/57306259565.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jnmnaog65jco9nrdl8pr5knkbi/gigenagexifusozamuvapo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21282a9be4---wumux.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/bi3sbeh72jdfn63tcd6g223c82/40999156705.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee9e63b09---2567958218.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba48fc8a61---97922071103.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+maintain+sump+pump+batteryPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 5228 bytes
SHA-256: 9e470d24512c3d47dc346b3717bc8f6306b81f898c837d812095252050bd83ff
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10968 bytes
SHA-256: f4e71607d08a265db8e1d9ea9bece5cf3fc4c64c0df8de7d588a6e615823c519

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