Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c456305e2b2a39…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 07:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3480164e59800566784b61525320b86d SHA-1: 65ed8a965934757994a083b24624c72e5d238981 SHA-256: e8c456305e2b2a39f6236690fdb4a1a9af1ece0947f58e694269ef51268b0a84
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly indicates the document's purpose is to trick the user into installing a malicious browser extension or update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://baovecongtruong.com/upload/files/16306520864.pdf In PDF document text
    • http://miyagi.chi-kara.net/Upload/files/bajujejewazaziwanepetusu.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/7868247585.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161377b9b10cfb---wonukiwatenafegosaxa.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/185166313.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/mozejidamugifawo.pdfIn PDF document text
    • http://keyday.ru/files/files/pimazan.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/musokazugufe.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/72829904139.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210917061358.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/zakewaxawagan.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/12303417514.pdfIn PDF document text
    • http://metall-press.ru/files/43161394387.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614455b49bae2---26355794189.pdfIn PDF document text
    • http://fourfoods.com/images/files/3121572248.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/dekoka.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/nezabalumiribobupokon.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614148a88e6fb---lamaxiwusavekopiwifijemam.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/tenoraxisekorunoxuse.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/zeziretalo.pdfIn PDF document text
    • http://sinners-party.de/media/file/49762982261.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/kuzumejelumasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cryptotab+pro+browserPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 20784 bytes
SHA-256: f8537d7dd3048f76d2e5657d3ab947483c273094c6cca06ccb9809e9645b5ff1
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 10372 bytes
SHA-256: 8a1b33d62b4d400fe50bacf54abb3cfab963a0af12c8f361a8fac63ce12fea45
font_03_sfnt_off00013f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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