Malicious PDF — malware analysis report

Static analysis result for SHA-256 511142c657b22286…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2ee3f5378b686bf0f1e7cea6e6ccce7 SHA-1: 12106b5cdbef3e0185ef83b10f115b238e7c5ef5 SHA-256: 511142c657b222869849ab9714ef459d721b17c4d70ed9902eda776a426c6869
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 https://thuanxuongmonmb.com/admin/webroot/upload/image/files/kivopew.pdf In PDF document text
    • https://aaaxxion.info/images/file/purisefafatikowujuzagivo.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/16409079563.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c7555ddaee581ebf034c738600767b10/ximomavel.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/ribaropevalisewunufa.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/muvifavilinuvaxaxemusa.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/revozepogosivajuwikowenek.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/hdrbsj2r80n8bu49sma507gh67/mulajoju.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/22605784110.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/49178533891.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa38cf7c005---52075917288.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c16fd58b4---75200741009.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ovi3th8nj6cna0ku4fk08ejpf5/jubemu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/91650460954.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f146f128476---satuk.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/62333201206.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/74499111616.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce23b346bf---futafixogizaduzeguko.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160baf6ec1bd6e---16404321225.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/1480604990.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7adc02c81d79e3aadbb0eb302174a1f6/62273425396.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1e2d484eb59f23090bf79f75b7e3f09/xuxemugoxaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=eso+how+to+trade+gold+for+crownsPDF 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_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 17864 bytes
SHA-256: 9e297822455fe808390f6e5dffe3837604debc1af3d5f92e87f5c2aafd769a1a
font_01_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 10732 bytes
SHA-256: 672b5c0415ff60060d54b5bbe3a4adc6f1a32344f55b76c48c402b655656edee
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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