Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8475d1cd357163…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 21:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d261ba342bd1b2fb74d914400e4c6c0 SHA-1: 09a0ddf80629610f07b87e75286d01b4eb9b8176 SHA-256: de8475d1cd3571632ae55698ce9c49bf7d42beddbbcfe4105750d508c1545324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=how+to+transfer+pictures+to+my+sd+card PDF link annotation
    • http://alituncer.net/userfiles/file/92071112804.pdfIn PDF document text
    • http://screen.by/images/file/nukalojeduko.pdfIn PDF document text
    • https://csodamalom.hu/files/files/zeroz.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/6615017679.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109120847406777.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/nixakekiwozovupol.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ic5qgtm8d86vkch5m7h8lbmv24/63881640022.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062871c3c1---mariruwuleperefisinike.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/wizoxaf.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/39033489742.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/89680093205.pdfIn PDF document text
    • http://mutitar.com/user_img/files/84011007906.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vigogubaw.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/90557455061.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kizuropifuk.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mj79pi5v7dgtll8unnd02d9se/1570754657.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/69188249052.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tunimorugodutiwijej.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/nopepilevezot.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/90e9782d912c103e41f08438858c5da3/5451066519.pdfIn PDF document text
    • http://hjhchem.com/upload/files/fowipunotime.pdfIn PDF document text
    • https://gdaniec.com/upload/files/zalokuruk.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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 11024 bytes
SHA-256: 5676d7832d95b2dd2b1e8c19c7d76a7fd3ac8fc60be43b6bd05a0806e3ae290b
font_01_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 17416 bytes
SHA-256: c66dcc73be5566d46fe912b1e2267af8d6cf6e5a137c409c2cbef2ab39ed6c25
font_02_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1