Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadd18abaaf6d50e…

MALICIOUS

PDF

91.1 KB Created: 2021-07-10 09:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 40f56d7e9fc80b403b0479f3d2940b70 SHA-1: f66a5c2f71033c651ddfe8eafc47f37a94c25cc8 SHA-256: aadd18abaaf6d50e1aec64e22dce58650c9c24f2909cd1cf39205b2530a7e207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=get+your+guide+careers PDF link annotation
    • http://alpha-cp.com/userfiles/file/25567109795.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/puvebobofepexazobagaf.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/51674640339.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/q4e11cahlunbo93emmov68adj6/52370057853.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/14u3m18pq7550hf2ta3s8pjlgj/16244118001.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608952f8a428c---81372357698.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819609063---75633865139.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/315a46f8ee9eabfdf57d9b0775067b8f/bimabunisesemazebetopabe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b81f477bcc9a0198b3b9ae3e660aada8/78615507424.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e628f41497---wegimopegixapoved.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/lurujakunabe.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/51609158521.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/44438071773.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8869893cfc---setomasipiv.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1fe1117b2843c3fd3c5ff0dd5b21901d/23983742882.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/4667574696.pdfIn PDF document text
    • http://altinay-law.com/images/file/wasoxefiwinigumip.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/48831259355.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8eg08587426q8r37gguo4spd43/gupokovepijifajoro.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/zakegup.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/838699904609482fb1e6f2.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9c6e02109b9bff3aaa453652e6d2b824/lujesapivelavusuwero.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a7ab9d412b176ec5f507ee726f041037/96097246282.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/44184415619.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb68c7b2db---91080247245.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_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 17280 bytes
SHA-256: 2f2f17951a0b8449ff7ea020a094a583bc20a28d462b64bfd80ecf3c268a6a72
font_01_sfnt_off00012ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 10648 bytes
SHA-256: ee7e77dea55dc75d66d4b0e9377b5fda521c19ff1f92687043ea212edfd7af34

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