Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd0e9f743aeb2bd…

MALICIOUS

PDF

77.0 KB Created: 2021-08-27 04:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5fa5751873c3e624942db146bad94a5 SHA-1: d719fd655f5064ad4a7fddbfe54d8dada71c495f SHA-256: ebd0e9f743aeb2bd039edb1d79512244a6af78557cfe48ddf1dc20300944de0e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function appears to be a link farm, likely for SEO manipulation or to host phishing lures, as evidenced by the 'utm_term_redirector' heuristic and the nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cd7f786e722cfebebbd5a1df9837be9a/ganibenokonetefuseves.pdf In PDF document text
    • http://oaklandscreche.ie/userfiles/files/zofijinanesaniviname.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf7c6b669f---vuzuminugodabax.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d29ccb0a---gedaxi.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/8487096691.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rk9cnft4c1obc1v7o4lcs38gu1/jixunena.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/89242307321.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e641c37ed504d6b111a2537e83c04ee2/78405281597.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vodavixejugekodo.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/lowotosibowiguvaz.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/zazavavudimazirefidinote.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/21027724064.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/pusowimiwo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607018abccaf4---bubidexavaso.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/xuzupinutiwuje.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0ce7dfe43d7d04eef29d06f18313251c/68518790361.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/datuluvewixufajal.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gusupezofamojexigok.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dee2ed220---nixijuku.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3db4004a---mugejuduwofa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30da737bb---mokilefodixivojarinoxo.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/doxizedidavulebezarewu.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/10035909639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=intermediate+2nd+year+physics+important+questions+with+answersPDF 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_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 11248 bytes
SHA-256: 80d5c2791fbd7b7e4690a3e42e19157d70a30f08bf1535d72c1d58abd04ddd1f
font_01_sfnt_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 16292 bytes
SHA-256: 8ff7ab36fa409e0851c92d20436c2e2c8073fd11ebf930425b87e2d745a5f4bb
font_02_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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