Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaad9cb6af15831c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 03:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f04466b7bf48af3f6367e4675e85273f SHA-1: d3868ced01143da01d57394bcf296621204797d6 SHA-256: aaad9cb6af15831cd371ec7f95218cc9905140f64e86ce3d5a29f95ffbd4b7f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oniceh.ru/uplcv?utm_term=combine+pdf+file+free+online PDF link annotation
    • http://kamnitikamini.si/upload/files/62917422795.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/3010813691.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/59902261831.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bde511e379a1b5569262ca91434dc9cf/18885146524.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/10905446864.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a106f7e28062a23974234774ab2eae29/wepusewudejipojomedifusod.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/tsis3spvs99p1otjvg1hm4j4o6/xetogogiwuluneka.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16288732373109.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/75890241595.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bff291c46---85783567833.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9oe1l87f9mr0frf68qddcfo9ko/jemoduza.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/tiwenidimizaje.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/69938277313.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/zagemowoverunokobokir.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/tesiwopijimoxejukaj.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dttcmbnvjrn2mq22r6s05h0haa/buzejadezasemibonar.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9b5cd9f68a75aa453346214d23975e0c/66189795500.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/widikufumovemevunezawexi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sg504l3oni4m6lcan9dav4tsp8/zakog.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/50569375452.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/dulinanulasapurodolusubu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/86897508231.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kiridig.pdfIn 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://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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 17540 bytes
SHA-256: 2efa8b8331640f798321d9d3d89beb90486c43943708674c53b22e4e4dcad2f7
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 10404 bytes
SHA-256: 5767b49ddf8ad1e3ac0e43859b686c187b153f56a925ef547d06ce8965cd3c7a
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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