Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a9536fbed1634b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 19:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2801575944b53ee7b38e486adb29044b SHA-1: e53d5d30369db8bf77ada2e4a7ed0509424cf3d4 SHA-256: 30a9536fbed1634be67a3f0daf7cde48313ff971cd88e77683eca77f83a962e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/zoretijujikojura.pdf In PDF document text
    • http://nato-denkmal.de/uploads/file/jidejobizamabegebovexi.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/16123735337.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/zafexusexiwazodexugofe.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_53F5C08BC86AC1AE.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bosinujaworizigetaxiz.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/64794b377fdbcf94728291ab0a91c40c/47530927573.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/11623711020.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/64711609347.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614979e53fe72---josunimepiguzikitulawoget.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149c06531a43---medubifakipevepemozejawot.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/90749701080.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/57529769127.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tobalujunifavurabu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/511d4240d60dd408e81b72fc79ac59b0/32122555176.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/62140568635.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/jowefivafugafasijamij.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0d09399ffa0b57349455842e16aee703/pemalosajebuso.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/48856342543.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/39575643323.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/zeramifamip.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/veneganufozivatavopore.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/53809025057.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tejuvitu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/xusila.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/23609359635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jumanji+welcome+to+the+jungle+in+tamil+full+moviePDF 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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 17084 bytes
SHA-256: 2d5c6c24f136789dcd68e25ee73a7c0897fc730a62abaee891921fe3991a7842
font_01_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 10888 bytes
SHA-256: d6e678616d8561dc15ec03100da9f18d2d5841791730f365378c835a33764577