Malicious PDF — malware analysis report

Static analysis result for SHA-256 3669ace6b790095e…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 12:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5abb69a66c8b224610198f55dd2ee76b SHA-1: dbf383516780c5bcf0e1b5331cae9cdaec05cadd SHA-256: 3669ace6b790095e8d635d9c5d93baa9a1054d0135e8c32264b9741f08b35791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=download+android+online+emulator PDF link annotation
    • https://kirmatas.com/userfiles/file/45217716516.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/37693923848.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/85748328662.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/suzur.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/68344166564.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/bezulunaragakidobekono.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/64604671075.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/votozavirof.pdfIn PDF document text
    • http://entrackintl.com/uploads/5241115503.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613692cdf0582---finimulasawawebesuw.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/16696447335.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/37573363879.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/992b18c0ca35b99c3d06478ec188e96a/mevagagazedelepofil.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431d4bc4c7c---16463760314.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9fc601093---56038341007.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/68546169828.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/65494458211.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9adebd53a---89948429084.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vsbltb25j9clg18hppab7fvh30/tajufabigopiwuwixe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d746f41581---kirawejepufa.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/gadijuvizetuvusojifaju.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916135120.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_off0000b1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 10428 bytes
SHA-256: ab8013088204667ca2b3f8b1d4473c4aeee52b6630fa040b398520f61515752b
font_02_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 14476 bytes
SHA-256: 23ea2f3a32adb4d377f5d791366be5d01bdcd360d85b8d1f2102726e90fbfe11

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