Malicious PDF — malware analysis report

Static analysis result for SHA-256 11989446a2a5d014…

MALICIOUS

PDF

98.5 KB Created: 2021-06-16 00:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: be99203523428e271bca2cb939823fe4 SHA-1: 893515a26d5a04c2d0f5b6d6a531a228788e81b9 SHA-256: 11989446a2a5d0148359fe2f839d91b51b9cf493ebfc2f4845331180c7564c44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of embedded JavaScript, though not directly analyzed for specific actions, is commonly used in such PDFs to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=war+bases+for+th10 PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8263372179---nofigino.pdfIn PDF document text
    • http://heizler.hu/files/file/56529678094.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/43511854997.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/p8kpffd7umbrsk7bpu7thtj9os/59847085590.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad8ad63c8---podaw.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbffe34eb3---90828458990.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/106001ebdb0c195deb3f4cb6ccb9473f/dotixorizuwejapup.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/auh81pceaglmukikl5f2r0lpf1/8921130229.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/233a56c0a67c574daf3286c3817936ac/10739542375.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/xotemedo.pdfIn PDF document text
    • http://klpa.net/userData/board/file/tusikejutidafi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/jefuwisigaxanexofetawija.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e4leg0rbinhrbi4t8q77b6mmu2/tijapimoguwoj.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b243eaf2---kufok.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7e959cc9c74dde00eefdc42e3eb1682b/61579338096.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096399125180---7473060667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 4804 bytes
SHA-256: a48ee6c4fb978a00526ddad37dcec3cde3960f3506289d327f35a0478b0d25fe
font_01_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 13908 bytes
SHA-256: 923ff61af456565f5aa4d16f2c8d96b4879470b8bfe49a6ec7254eb59c749064
font_02_sfnt_off00016f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F68 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2