Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24ad3835ad0b7bb…

MALICIOUS

PDF

82.5 KB Created: 2021-07-18 05:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 431265db1c70e342826bbec6c085e8d6 SHA-1: 2f0dedff64c375f37c074c1a97a3f686c963a8df SHA-256: e24ad3835ad0b7bb0ea2e480dfa6faaeb785cce90fa6064095a0a343fb967b55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve as redirects for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f957c50ed---32541874538.pdf In PDF document text
    • https://nasikampung.info/contents//files/19596494250.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/delujofikamisibisitanator.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160918a7d3476f---viroziniki.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160706295657be---fokuw.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5757976bad7b82cc43886a7b489cc987/pijajamalukixutunikuke.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/nuwozub.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/34703400983.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4fcb3385c---lomuxuvifoponuwo.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1620298230394.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcaf9b477---kuwubovopopelejuvowele.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/diditibik.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1e40c3eac5d9b1205ecf598892331d98/vanoluzunoletedoxura.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/95017417286.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be6fc58961e---pavudesevepiba.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/48967788823.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/76767403531.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7222489f9---1094186761.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wojufax.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/66219134306.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6474a825a4---devonopadigu.pdfIn PDF document text
    • http://hevolta.com/upload/file/dojiru.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d398ac2f0---27967799971.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/43413447364.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/zebinegebema.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/24989228427.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/53481011159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=today%27s+answer+of+kbcPDF 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10660 bytes
SHA-256: 41524c10bd8f7f526fcee057f34991a1a6071ec224849653d6088400dc66d6ef
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 17936 bytes
SHA-256: 62dfe5464b67d1fa28aab1dd7e8595e6c4038bfefb6b45aa6b293a1481088acb

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