Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e85cbe819c32e0…

MALICIOUS

PDF

101.1 KB Created: 2021-07-30 20:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1a70e3bb050c92d5ad7fcdb1515caa43 SHA-1: 13c32f027cdfac39b4640280aca9e5befdd97b1f SHA-256: c5e85cbe819c32e006d136fcc59e80b915f0623a59e1e08a7db48c565736a5a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary function appears to be redirecting users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://escuelasfutbol8.com/docs/files/50175445042.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e35892dc2---dixatikusi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3774eee5e1d3c7dddf83ac70dd6acbf2/43857760315.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pnc0h7ginpq24vslgrf56rko9d/3424235987.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/91761412045.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091afb63ae24---jigusoxesozo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19e7ebbcba---75445563328.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/55440018547.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/73220402421.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/41852527956.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/bepezo.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/65951126504.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/nulowar.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ua3psd9p6mvjaet00stj0u35h1/bajoluzoxuwazoturel.pdfIn PDF document text
    • https://davaocarrental.com/images/file/99337407538.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/vitefuzubi.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a779c00b6---kaxigutiwanaz.pdfIn PDF document text
    • http://geodez.com/pliki/file/81638516532.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/696b7b861f17ec175278bb65b9bc22d5/mevosudajuzemo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf86a89017---rugevajifujawap.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f48e7a1d---bizovajusariparidiri.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/82ecfd3020c73c0130cb3118d503a6ab/gunadinoborulonetun.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1d175f2f0---bokapu.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/21633590177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=is+flaxseed+oil+good+for+your+hairPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000125e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x125E6 27804 bytes
SHA-256: 7e737bf98ff432910f3b03be4e122220c1cda099c0e94443801547864574cb97
font_00_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16464 bytes
SHA-256: 0addb803d771455766f0b3bf1711f6aa1ed250007d05c2a0d79b43d65148e195
font_02_sfnt_off00015641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E58 10696 bytes
SHA-256: 575b8f9bef1de3130c0f5391fb7bd568ff9bd1cf48f5257a2a2f85c71a4af85a

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