Malicious PDF — malware analysis report

Static analysis result for SHA-256 6105cebd459bc701…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 22:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 491d412082e3f366a5d791d4fc534097 SHA-1: 34b18a2a6167e3634aa2364cef2500072588232a SHA-256: 6105cebd459bc7010e7100a8ece8cd7decce770e116996e895f4e363fa25c1fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to domains identified as disposable or compromised, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

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 http://dejede.com/userfiles/file/tejugugidasotiju.pdf In PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/xelatagugo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/jebizere.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/meximif.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/58600961079.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/wobub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3679ab31c---mefekevifiruvig.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/99876861214.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/30864706307.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6ae20f7b9680036d4692f8c5d8af5148/51814253108.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255543562d9---93947509087.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7gf46up6aa2lrkci5q6urtetvm/73284468169.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nifubopositurosopugivivo.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/78056063346.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dc29c7a8---50701406403.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/puxuwejaroserekidikon.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nrcobvvu98m3nc5qglogt3fjh7/83468792985.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/50454504328.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/gekovapivodimakemegapaki.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780ffc22790---58456521353.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/gogazipoxufezijekolulaje.pdfIn PDF document text
    • http://12shio3.com/contents/files/xifekabobudonateg.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/66481237837.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/rivebefedunipetod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=walkthrough+harvest+moon+a+wonderful+life+special+edition+pdfPDF 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_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 11404 bytes
SHA-256: 1052797e730019b2e6d9c71c2e4a6ed245d8b858f16b19942859167556d829e3
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 18856 bytes
SHA-256: 924f507acdb4467e0c72cc34fc6421c386e96d328c88b60edcbadd82a36cb079