Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4241b963a69505f…

MALICIOUS

PDF

91.2 KB Created: 2021-09-23 11:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e6f07b59aa6b5090fd04a5907ab2622 SHA-1: 94dba538c26f2809b791a621324d1c101c6aae95 SHA-256: e4241b963a69505fd0e25850ab7310198aacf980718eaef814c4262f0b0ad8ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains external URIs and links to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=car+scanner+full+version+apk PDF link annotation
    • https://ofertaromania.ro/ckfinder/userfiles/files/tuwibevozuwijoxilofi.pdfIn PDF document text
    • http://grabnerestriche.at/44197754301.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/95626219736.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3c7f4234---zutusetov.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/boxinobesuluxujukaguruj.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/51958681182.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/96178240489.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/17169867911.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134933078a76---nekixejedilosuvuv.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/48807066221.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/70970322281.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/84001010285.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/13977105395.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/93406570589.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/pifolenemigefamoluteri.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43148319136.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/48553659616.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/bigixewatadoxirimudaniba.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391d4a44610---dopebakiradap.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/8525255767.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/daxunu.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/wofiwixifevowos.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/faxebekukedumeri.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_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 10664 bytes
SHA-256: a4c23cf3a6db7c02b4a42c20b60a9e9dd552dd1580853106e01c52380cc42c78
font_02_sfnt_off00012dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 19076 bytes
SHA-256: 7340fdf4e7ab0764f3244dfb7b7179109cfc4f2ffc3e04a090c6327ba579f37d