Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83fc5e4559886e7…

MALICIOUS

PDF

79.9 KB Created: 2021-07-07 06:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 735d15bf1a2490263281ab9ac006e65a SHA-1: 351de8a8bd8deb1f163135caf7e4f544afc0b7c8 SHA-256: e83fc5e4559886e7ff2ff5387cfe34409dcc44a2cf0877011f04294100ccae52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=tingling+meaning+in+kannada PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/99697255617.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb488d2168---74114546023.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/38292836005.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/budubirer.pdfIn PDF document text
    • http://ozari-ua.com/files/file/65174526190.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755cd705dbe---voruveda.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7285c3b74c---lezabesozebinum.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5630fd5f90---vidupuzeduguvojujakom.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a6fb44d2---lapojerunawel.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rmerh9j19llgb1g88bg96lh5s6/41594975184.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fa02d4df6---1036394989.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e8fa4bc8---lemot.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f5ab2993344924668e8900e009073090/sofekepomesozabo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f3c4f1fb---60468722461.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/kakakemufuzili.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/66009996206.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/72372958192.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc323c644f---soxepulumegagiwi.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/kexetoguxuga.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0652fb1891bfc07136976f042b1da103/17027634022.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e997a50c---50960738312.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/856034907e872208c291f6a0a784fc13/69661874633.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/5509773273.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da804ceddec---napotidisofoxusuwut.pdfIn PDF document text
    • 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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 18200 bytes
SHA-256: 0d042d6ee992326abc385be5a6eef11cd80b796f8f0ec34496b093ddc62e835c
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 10160 bytes
SHA-256: d71eb6a5455f7528da6d073b69e3a46f7ae985550c3ec1ddc517c3e38b864688