Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb334a8d5d17e932…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 16:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75baf6f9972c07071bb56e0d7f153947 SHA-1: c3bae000c74674541e07172bd0c7b4901668bb66 SHA-256: eb334a8d5d17e9324995708de4e0bd69ca9c2bc729b775602e8941640bb9589e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS upload storage. The presence of external URIs and link farm characteristics suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=combustion+reaction+of+pentane PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6f2e4027---58398861812.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/nisimor.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/49100168356.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/9378838438.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/divipaxuluniwizawex.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5fb227e8---mutegagugafetarexanoka.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/juliwuseditij.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/gepil.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/patupe.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/81463785107.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133823d8746d---714508763.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/49875899530.pdfIn PDF document text
    • http://keacg.com/upload/files/tojutotemoniwaru.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc23825db158a4e34b74d715f0e53c3e/22621576022.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/82027557784.pdfIn PDF document text
    • https://isleo.com/i_photos/file/zesuviwigoxebirov.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/14224545907.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bedila.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a2c2ed14b0bdd7603a1c2164af757d7f/wasekaxilugedap.pdfIn PDF document text
    • https://brod-plovdiv.com/images/kelotapepuwufukevod.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zibafamamuraguvolo.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/86168547241.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/foporixuzudutone.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/98915063483.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_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 10864 bytes
SHA-256: 7bdcaf240465ebba6b6d5e427dd6255d16f9d14087e83bb75f3edc215e242ac3
font_01_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 17228 bytes
SHA-256: b8ff435b8b19bfcd67bd8ccc9f18246236d3a11c70966de5d5d08fd451e9a897
font_02_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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