Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63d8bd3ce3940d7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 01:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a391a0e3cd7ae0006468b85eaa21cea SHA-1: 833ce3cf309a57842ad47af138a8809c6240b65c SHA-256: c63d8bd3ce3940d7f57995388e26d5ba47bdaf8332e4d3e59905fff1752dab24
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The document is image-heavy and contains a clickable link that directs users to a compromised CMS upload, likely to host further malicious content. The presence of multiple links to potentially compromised websites suggests a phishing campaign aiming to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://to-tuong.com/media/ckfinder/files/62047790600.pdf In PDF document text
    • http://innovad-ltd.com/userfiles/file/roranelozibabufifomuboxo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc1cc9ff98---89093371459.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06ac306a3---nufuxagusagixu.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/92326620324.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/bavavabiruza.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44dd6064b---28479158251.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/widobexejanakodufovamelo.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/35851499377.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/52788626403.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/mifopudoz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lizibizijalepikaderumiru.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/99675557185.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9c3ea217---77542784955.pdfIn PDF document text
    • http://e-menu.hu/editor_up/piwuxojusolitanir.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/74542932564.pdfIn PDF document text
    • https://umutfm.com/resimler/files/kewasavijeriliregapowi.pdfIn PDF document text
    • http://berbun.com/user_img/file/rexasalumegax.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc44c9c6be---49988270785.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/45592963444.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/jojijorawiduzubidavutakim.pdfIn PDF document text
    • https://cmoretv.com/userfiles/27679938412.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/votagasakajafak.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/66184227477.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/94401266330.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/56149560984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aplicaciones+android+descargar+musicaPDF 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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 10840 bytes
SHA-256: c8a9d1230ecd3ce62e5ec1ac3b1b07dfd0dafb16a0ef454809e54ef8670bfed3
font_02_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 14188 bytes
SHA-256: 10a8c320f2773cf7b183d716a0a8275ca76a7e129b2e715c3bc8e2fbac3ec12d

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