Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e889d4354c840ac…

MALICIOUS

PDF

83.2 KB Created: 2021-08-15 15:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b35a62d1f5a87e515e6ab81c23986a3a SHA-1: adcd85a456b676165cd5e5791579bb244a9b8669 SHA-256: 0e889d4354c840ac6a0dbef703786e125b2a66ebeb8dbffa6bf3b73131dc44f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://uniroll.pl/user_images/file/gedipir.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ca221151---56382854424.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/33908add8bc8575138db2b6d8776a5e8/nuridagerubifedijakodegis.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/8c4736b1104235c1ecf1e009f4b9a2b7/gimurebapidut.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/kuzutepomasi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/88559416330.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210529210351732.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/venuwax.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f0f0a39304de4e1f03032fc83e6ff9e1/jeduzire.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/dafawapibezu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0f334e4c---44396654450.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f068470d15---30055069531.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/59ac4b4e66ae0cc6f337da3794cfd129/90030058038.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/40761994704.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fvre5np3v1v4jj7j42nl9ilji9/kekemokavenojumogunisasu.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/17173418112.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/widelof.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/1426807335.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/4489900191.pdfIn PDF document text
    • https://ubranni.com/uploader/files/41235084295.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bab3d7196d2---17154741482.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/xurekimatonujil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=guti%C3%A9rrez+saenz+ra%C3%BAl+introducci%C3%B3n+a+la+filosof%C3%ADa+editorial+esfingePDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 11320 bytes
SHA-256: 4d57383b57338ba1cc0d24ec91f56a981740183d8830c06fdfe9e38a64317b33
font_02_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 17900 bytes
SHA-256: 4fa29b09d67d6bacc8797f2715080b57c05c47d47c8e624023dbb918c406eee9

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