Malicious PDF — malware analysis report

Static analysis result for SHA-256 de02a96fff0b0788…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 16:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf7da8a4794ad46bf7356ae73e315288 SHA-1: 9a8734870724f480d0b16b757a9717e0f632af5f SHA-256: de02a96fff0b07882af8a6675e1838caa749a8b8077f174efc534c6a5b1cb1bc
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=play+bad+ice+cream+3 PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/nitorujo.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/denunudibariremajokizose.pdfIn PDF document text
    • http://riversedgefm.com/files/file/66666721970.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/gututufapisofabufavup.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0202671c---14965472217.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/6131575262.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5185f02fb1108c05614454c0fda017eb/99600670135.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/59180286580.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/17231270127.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/guzewezam.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/darupanudobuwoje.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f04553ab8a---pevovujiziwo.pdfIn PDF document text
    • http://computerdoki.hu/user/file/51301932603.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/16299309232.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/muakjlfoejf9jalhf5gi1ivf9j/nixunapejepuji.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gigamuzebuforidavewumu.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jifatimisowufa.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kelozewukusurikuxuvunezum.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/97499039176.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/35756658905.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/sujobiwutadomezadewamom.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/26805211921.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/75587113773.pdfIn PDF document text
    • http://gewald.ru/content/Files/rinipudilulexeramokebog.pdfIn PDF document text
    • http://klemanpince.hu/files/file/musolitujojafagutur.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/48438212072.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 18332 bytes
SHA-256: f1258155d8d93a2033617ee82d8922396a3f659c350b15700a395974e197a0ee
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10468 bytes
SHA-256: ea9130c324b8e55ab943527f1710f1759117b9eb21514aee7b10ef36b1e1dc04
font_02_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1