Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a623b3d4d0b9b4…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 11:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e760c2f318cb4906487aabdfdd27f65 SHA-1: cd2df59e0f21ef2acbfce9f4947e04d05295e9ed SHA-256: c1a623b3d4d0b9b4ce0289a1766b658d768988a4f1b7d69ea8e51c8eec6c4113
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure align with phishing or malware distribution tactics.

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 https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/64890610488.pdf In PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/41044206260.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997dc21237---2319737456.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/76020917221.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/85988536084.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/946f6f68c1396e2302dbc45b64ca1ce3/badapolinupadu.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/sezijefezonulijolos.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/58260938872.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/39348589206.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/jokasaj.pdfIn PDF document text
    • http://apcmagon.com/userfiles/52115591939.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f27ae045---kuxawoluzibavorulabito.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/12411932026.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a4bfb3839ddb11a29df22354e74608dc/79511461579.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qji559tnblvmehg1f2fc652gep/51514943428.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/wosejulumamotetudu.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/nufonoje.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/bugijafoleseg.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/da99054abfc3c9fa40c489172e073d39/92565612611.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/57364950031.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798f02407b3---pofaxewosibisi.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/sobukivotubi.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/25531896175.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/77247152443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hypnotic+words+and+phrases+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_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 19000 bytes
SHA-256: 1477c443ef301c3411ca5525f4f67d7bf4ecdeb3cf019f031c397bc5b231e6a3
font_01_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 10864 bytes
SHA-256: 5402777a2cfbfa43176a3245298439c5ca3897b72654cb900529e10dcca560c1
font_02_sfnt_off00013913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1