Malicious PDF — malware analysis report

Static analysis result for SHA-256 65430d7ddb7121c7…

MALICIOUS

PDF

83.0 KB Created: 2021-08-16 03:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1528ce48df01185fbe11337e92235fb8 SHA-1: 3d307b0533236323fe8f5cdff8029665978783f5 SHA-256: 65430d7ddb7121c78c80a95ae7c727147cfed9dd06ed49161001d6f0c43048e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully detailed, further supports the likelihood of malicious activity, potentially for downloading further payloads or facilitating phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hiddencliff.kr/FileData/ckfinder/files/20210605_C46242B01FED7DAD.pdf In PDF document text
    • http://waterreducer.cn/d/files/9508451093.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ce0b3289---dulapen.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d6ecdd434ba3337481f75e36d99b9333/xenuwamadoluvirabesesipe.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/38922657195.pdfIn PDF document text
    • http://usateatop.com/_upload/files/39655328988.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1aab66b7b966f69ece25c73e58280978/dewapo.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/76839057136.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c98d541cf3465a6ebccd39d7f8f28745/71515017394.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/pidapulibuloxiju.pdfIn PDF document text
    • https://gencatakan.com/upload/file/22421515274.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/47695bb942c9c9a77cb7a34a00433fa2/52849059572.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d0945a22---81237305444.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6037ce1c94877a1a2cc2e4ffb2611698/16264447775.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/77214315810.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6f5ccf452a4ae8f310ec28040223b4e2/58141554101.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/latuw.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161165f8c7f696---19050203569.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1a29ea48---34885213604.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/mexov.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609997c7e6a15---50288764027.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/76791091276.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8f48571e9db184552f199243a3dfe035/nezomiwepige.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/0vcskrsp5nlgu65jbgkkd0df6q/jomadilujad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=phd+research+proposal+sample+in+marketingPDF 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_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 11052 bytes
SHA-256: c8d0fd8d6ec7bf4086c33b17b128bd62078dbc2f291ec3a84d0148b5b89fcde5
font_02_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16856 bytes
SHA-256: d4c4c22869f3e2e2c072e15f7ca191e52bcbb4bdbb83fc8b5caf7642a428f69a

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