Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc204760ec287651…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 04:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 927f7fac8208585e9a41eb7d3944d2a8 SHA-1: cdf620260fe173245b9b2b8f96b203bba7419789 SHA-256: fc204760ec287651adc8c8ec29c4d72b61da8771420ca48efc7d4ce0475efaef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing indicate a strong intent to direct users to external, potentially malicious, resources. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=ds+tunnel+app+download PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135e526c3e84---40012932899.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/19513788089.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/votopeganefopurit.pdfIn PDF document text
    • https://zzhqhi.com/d/files/28401847471.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/30276254791.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/tawurizabuwizirob.pdfIn PDF document text
    • https://limsurempat.com/contents/files/figukafazoxefubivevobov.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/22834188678.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/36377053905.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gasuzabugikikodivibuxo.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/736754844.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/bedejemonokebiwulaz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfb26344d7---dufusigesebofuwosare.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/polutus.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/vewuvebemanowazex.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/mokezesuteguwoneb.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614f29a96d1b0---dedezoxaligedurazanemulaj.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/funerowokudepitobumiruga.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zoninidijejojiwabumowule.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210918233623.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091811484570554.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/nidulabemexejeza.pdfIn PDF document text
    • http://gro-felix.si/uploads/kawijerezodenigudiviw.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/nezirowazip.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/dijasodorumoponerabumal.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_off0000b714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB714 16732 bytes
SHA-256: e0b4a5859de631da6e0ac28849ceb372642d866cfb3ea0e0913f1fb7afc736e6
font_01_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10380 bytes
SHA-256: 81cceb852b5b475e7f7d44a7e413ad933f9dfb68d25f2492a5aa13fb50068f98
font_02_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.