Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e634f0c1aea38e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 14:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f1f9ca152a7f5322186996664bfd08d SHA-1: e627509050ea01e4bda0a31881c1bbfac2c897c1 SHA-256: 00e634f0c1aea38e7186d4023a643d7e920992a425e664642cf2da298c7d1ac6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daf6293a46---73712770339.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf2476593b---mebetibitexodowek.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/mudezosapejuxifelesir.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/89060385813.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/vugagogojixerazemunu.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/jakafo.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/71292559307.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/vofuzawarususajaxe.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/tiwipujafelox.pdfIn PDF document text
    • http://wsm.hk/images/files/tepudugojevigolebe.pdfIn PDF document text
    • https://jin-ji.com/upload/files/99213693033.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/28240747297.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/33711136067.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ef1a0d0827c79f458306d2b9ecf42b3/91624080525.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/4564495509.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210910220250.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/mosezipufolaxapurim.pdfIn PDF document text
    • http://samtle.net/ckupload/files/dijizovuredezajakut.pdfIn PDF document text
    • https://pellevah.com/upload/files/tubarifixakijosonor.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382e7aceb0c---sozonekufawefekis.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/munewelibufedizulenov.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/43720001210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=factory+images+for+nexus+and+pixel+devicesPDF 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 11324 bytes
SHA-256: 4b35c50bc6275f936cd7f37987e9d2cd55e30b14e2b2830c02c22dde69df0f41
font_01_sfnt_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16516 bytes
SHA-256: 49ce1ff3f437c559ef4905056d398ad6442cd92a4461d51719dace5b964816bd