Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f5b246f94da995…

MALICIOUS

PDF

90.9 KB Created: 2021-09-01 22:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc66bf17c58083d422be27f081fee038 SHA-1: f15362367f82436e9b114f6f955307c3a9bdae3f SHA-256: 51f5b246f94da9953589b9e6d7bd7ae55a7109a626d40e1d4e0aa7aa462b61bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's purpose is to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://ketchas.ru/uplcv?utm_term=9+to+the+nearest+tenth PDF link annotation
    • http://creativeindustries.ru/uploads/userfiles/file/73045454841.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc552c76a---2164469726.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/taxupawezonomu.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/xuzitalolibejovako.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210710/file/16258650596843.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/686990bdc627da313bba49a2201f9136/vofuviwewutoninak.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vomaromepufexiz.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/62431402873.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5190c9fb5---todukujum.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/tujepodikurilivilefo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cc48006c3b8b0ff041e6859e03f51b1c/75152958476.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/mipobajekitowajag.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b231f57fcca---selubudigam.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/14856954659.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/65536523541.pdfIn PDF document text
    • https://socardan.com/userfiles/files/zesolasivejosedilug.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b824496631---72398394180.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/8685129643.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5e521958e644d71da22f008ee944a553/boresikafuwipozebibod.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/38203225702.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773386b9f4c---91786665649.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/tetigelon.pdfIn PDF document text
    • https://kaimano.it/file/62720879321.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/nakuxonomeriviv.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b9ee0d41f---jirirowizevikoxoluxoxofuj.pdfIn PDF document text
    • http://haki.vn/uploads/files/46867596516.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef64e1e0e---megezawir.pdfIn PDF document text
    • 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_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10136 bytes
SHA-256: 1becea2bf1c10667eb1f220a5fd44c5de3b34845446178f76e127049f9938229
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 19152 bytes
SHA-256: 1f133ae5d2a40f45efbc32e66883b9552edf95053da8e7b48dccf65d4358b58c
font_02_sfnt_off00014504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.