Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05b9fa87356e818…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 05:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8fbfa99bd47172c2b4eeb9e10c7d5a6 SHA-1: 4eaf2b366a1d61ca2d6e01647f33fd780c5bdb03 SHA-256: e05b9fa87356e818132ae8f39d3ca5dc2a96f11f39a91ea3f2d310ee64676156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://ebsenglish.net/_UploadFile/Images/file/pedokosibezasozibu.pdf In PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/veleparotuxizopidenaw.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/sadodelumaponeloj.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/xifegelidofutarafufefo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/07bd5a7b2368dd699bf156189d656244/56438986070.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tuvunepibojapuwolerix.pdfIn PDF document text
    • http://podarox.ru/public/files/gofuwob.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/rizavixazo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd7b9be01---62579750291.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/nanekes.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/zupufetupoleroperiwiv.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/70301363667.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/xudapak.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/20803655875.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/dajitux.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/wajevalerofaf.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/93670895921.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3b9fd3db38a3b373693250ee3cfb8b34/motofevoweketixemezum.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903113015341819.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/21900400325.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xolufitagosesonunolig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+printable+afrikaans+short+stories+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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 10804 bytes
SHA-256: 9bae850da78644889be2623a54b3b0f283a1df2de98ecbc62884a5c7617d5510
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 18940 bytes
SHA-256: 4afc575f72c946bf91224d9bcf9e6c5c1b5cda25b5171cd29c37ab4b050db6e7
font_02_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1