Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac080ddb5a377aa…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 11:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca338595072e0979dade8eed5483c28a SHA-1: 2e53210c2bcc8c6c840aab4dbd03a61b7ee4db36 SHA-256: 3ac080ddb5a377aac42172aebe9e6c402d5659aad2537ca361298a14f8601bfb
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=imo+apk+mod+download PDF link annotation
    • https://machnik.net/ckfinder/userfiles/files/57189075570.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/73627119247.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/nugutaromufiwireg.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ac28cfa497e1e43ff284e1f7bf1c758b/59398934244.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090215065613.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/98789374982.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/6044635343.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/zamikawanagazokebulefija.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/39757940314.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/fevojixowavuj.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/zomutijajikagak.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/genefu.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/57994686184.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/jobutowibefigutitugef.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/60694530320.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/rozoriki.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/74626966995.pdfIn PDF document text
    • https://soechi.net/userfiles/file/16123551872.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/85547487742.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7cb2dcb5dc58fbc5332e26bb0c6e7375/99827234004.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/jekobot.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac9283dab---63073056905.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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 17264 bytes
SHA-256: d0e10f322034b317cc6b220d846dba0adaa39512bef9a69a44d72a29042a1261
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 10092 bytes
SHA-256: ba4f53d8271ce87d998e9f38d113e87f2dbb215e9e3cdc4a7d20cfd4e61519e0