Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ab0af1ae8376eb…

MALICIOUS

PDF

154.1 KB Created: 2021-07-30 00:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e4ccc7bef7f215d2b662421c85ea25f SHA-1: 901854ec27015612dffc7e830a634bb95195bf78 SHA-256: e9ab0af1ae8376eb8aa938515f1c8c91242f36eea5585d28d3437eb9633aabdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/40156884353.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lfph1h394bponi5icqfibtdjkb/19060100094.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/95907900763.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/dajanikatebesobilifigugip.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/180c55874e5d9d57c7260e581d5b3ac3/fidikofumusotatij.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8e2f0cea27946248c10e2adaa1dbcf0c/punoge.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836060a93eb---6854010437.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e84be92f821---25988950438.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b599a6e0077---24398942924.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xurezeredebenifuta.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/99193478161.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/htlnu8n5stjulorp5t4vc58e75/91227598317.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b0e969214b302fc69786c6c8f4839a8a/jexisumomejujigegok.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f28ed64fe1f762cad8f2dad8084e9dce/11428659025.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d206597496b---71723838261.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/jugebuvad.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/85249282425.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/bogenitedilubariweropepo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/wixadafegan.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/54757808581.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dotokanexorutinonog.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/19218516143.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bb7e0ae8---temenolozatinufodul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cours+sur+amplificateur+op%C3%A9rationnel+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_off0001f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E14 19076 bytes
SHA-256: 4cb6fed88fa81c63f1cc9a8a7c4528eea74227d519e37eb73c78121136bdde68
font_02_sfnt_off00023dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DC5 11064 bytes
SHA-256: aaaed2aad410abcbfdf0b462d9e86b9ddf7679e3c552d3ab3ee36d6fc3f9fe05

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