Malicious PDF — malware analysis report

Static analysis result for SHA-256 e841014fa3d9193a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-10 16:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8dbc418dfbc8c263118a9c64e5bbd5b6 SHA-1: 0180b75d1573656e584cb2a502e4a6bcd9469a10 SHA-256: e841014fa3d9193adc9d8a8faae4878f34f2b3e1a9c4de0746d14d5806223b6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=fullmetal+alchemist+brotherhood+wiki PDF link annotation
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/zinivixafipamufawiramunev.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/71435886573.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/37081656153.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/kifivuvexemevo.pdfIn PDF document text
    • http://sieuthibds.net/images/files/40003520465.pdfIn PDF document text
    • https://maturana.cl/upload/file/43885209684.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jubogewosoxavapagisul.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/mevedoleluxu.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zadapesexeberovokowaxizuf.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/93385913931.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/13267650533.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3676682e32c22a88aed9ef236ace13ca/lipoxis.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc9353de8---mulafapopujunavutafeg.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/37092466205.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/jazirimapagumavevadape.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/tidenaguwukatumalibul.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210910042619.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/13800485196.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/dasajesogadiwodo.pdfIn PDF document text
    • http://profstil.az/userfiles/file/52877746189.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/38627607249.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd030fcf7---62252312554.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/172e80c2808122a8e04b83d5d0ce5c44/dokomap.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/3056497532.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/febujujul.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/loxikozevovajijewafujeze.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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 17064 bytes
SHA-256: 7f1316c1d8d89e3cd9064945268c9904abbc87f226303a7bd04bc9e29f87b2f4
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10924 bytes
SHA-256: a6dc265e17f6fec16f55a92d90fa12c9b68788d8529c6a092215e7c595b70fac
font_02_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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