Malicious PDF — malware analysis report

Static analysis result for SHA-256 143f4f90104a71a2…

MALICIOUS

PDF

99.7 KB Created: 2021-09-04 22:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1a8520851ddbe17c35a61325fc3eec5 SHA-1: c34d311f22be1ef1494d3511831b2c9b6c9ed468 SHA-256: 143f4f90104a71a28cded1a3eaa3ebc2a3af99c8bbd537d58d21011391d66c64
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this is a tactic to obscure the true malicious destination or to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57226650682.pdf In PDF document text
    • http://dzstock.com/Upfiles/file/gudowejudavono.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/hcl8ggua6v191llhoipkkrusnh/13693632670.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b5218def6f97fbc3ac343a0c768e980/13870157860.pdfIn PDF document text
    • https://webmenuplus.com/images/file/17763172642.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872812e88df---xulovururibifejekizuwile.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/61077552110.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b1f395de56bc5a50fda0ae1e269104aa/tozekatol.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nagejuvirulevas.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210823214651.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150e42e0fe7---sufebe.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bpjfemrr6fron0ed4q53p0re7d/renowinek.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160de474e3eef7---xogodonig.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/72900616057.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/gedifevovevobalusuja.pdfIn PDF document text
    • https://angkalaris.com/contents//files/38085333259.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c74dbf6d---loxinur.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/16164449368.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3f0492dc234c98d1feebd318bffaf3fc/gapodusojokezegewowa.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/79400473098.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8b0d5cf78bda4446f3104bd43136703/pivesegixizikej.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jsaplnulgn01p612n4h6cetf1a/kinobadixalepunuledimirof.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dosofituba.pdfIn PDF document text
    • http://salkim.com/userfiles/file/50767127340.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0b6c119921293b116e804804ba12c449/88111152411.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/17316959894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=revolucion+rusa+sheila+fitzpatrick+pdfPDF 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_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 19016 bytes
SHA-256: 2a1f8a4858b321d4faf1366822a89ed046a637e5883155180d970fd65fcd34d0
font_01_sfnt_off00014f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16730 11080 bytes
SHA-256: 711a5e18ef21b6121dc39aee079866d43252029e4347d2d151c2358db07ba38c

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