Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61d1e22d5974251…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 02:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ea50d4d53bb5de7a4eee11504ce5d503 SHA-1: 34f36b86a00ebc26716c8d8bfb056c64615fd2d0 SHA-256: f61d1e22d5974251089e6ba55304eee06691420d4358da21ac2f6c3f629f38cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://grandviewgroupresort.com/upload/files/siwaduzi.pdf In PDF document text
    • https://urbanlivin.lu/userfiles/files/takonolonosafisojuwerom.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/romadiwip.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/oqm9qk336kaj6bkdf3erleokkk/92815934848.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a61348cae95---21655402791.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/71108604938.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160842098b3a3c---89030808186.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sekakukipun.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/b29i9e1aoivtpg509qu07a2uvm/zonipotasejemat.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/jopilujuzojijopoletofep.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mg7vsfs8mohkqij5vut31tueku/45932147745.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/fitagopupege.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/pawos.pdfIn PDF document text
    • https://faceless.me/userfiles/files/nobotanedigirigarosasonut.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/sefejogip.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b1a0bdacf---vigekone.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/30078210492.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/tuduwamomanekixav.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/ranovi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27d095165b3cb123d2748f3f6d3eaf9b/badowogevujuzakakotu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/4773488996.pdfIn PDF document text
    • https://olterus.net/contents//files/wenuxujiserijetetiriri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stephen+r+covey+8+habitsPDF 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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 11028 bytes
SHA-256: 0048a176dc4de7bdd0899f02e33ddedaf7ebdd1fd33525800db2a05bef439c22
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 18640 bytes
SHA-256: 6c3bc6d56b03ae625a040e6d4801d2e1824b4e0038b9dc93c6afe5a7137f808f
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1