Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dc70454a520709…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 06:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3aa4f0ec05af6ecc0455d13f7ece50d8 SHA-1: 9a0b3f45e41082bc9634fdf7d747fcd118bfc591 SHA-256: 14dc70454a52070917148e2a758260547a69d6aa1c742cfe4bc21b4031a82420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest an intent to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://catamma.ru/uplcv?utm_term=how+to+broadcast+from+android+to+tv PDF link annotation
    • http://nage-z.com/ckfinder/userfiles/files/wonitopaxudapu.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/rejefekex.pdfIn PDF document text
    • http://sinostandards.net/upload/files/51175977404.pdfIn PDF document text
    • http://czyxchem.com/upload/files/47211363095.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/46804172776.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/pozosodagoxoxodiboki.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0vpvecof49kp4jshdhjh6lsir6/67990392903.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/39787359349.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/lotanapowubunavepubol.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/916ac866a731bc56b723b143138c5703/zuzumakamuvowunemagadade.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/xugejosapokudovetovelozow.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef857bc53---31160832372.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b60894ea---pukedaleta.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xepifoziloxemarekorodo.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/38186570213.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/pukazede.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/51090561774.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf4e8a68f---wamulavosulomotivi.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/sevojetosoxuxenabirebagot.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8453afa0336ae6235b62c29599ad7bb9/73557812362.pdfIn PDF document text
    • http://chamdure.com/DATA/files/7949565631.pdfIn PDF document text
    • https://jensbrode.de/files/file/ropenojugizetakuwa.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/mubumoviwiluza.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_off0000c2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10740 bytes
SHA-256: 65d2f74f9077d8a5dbd6c727df1beba28ac3a04425004a8fefff976cf3b96094
font_02_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 16308 bytes
SHA-256: 811c918a3b37893458441ed468fb362e3694d68a00d6f9345a2fe4a28a2a9674

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