Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a7791ed525d767…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 11:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33ae0dbb6b199049f1a6172394a74c09 SHA-1: 06daa476d09cfb17205efd82c2b8335ee6aa1cef SHA-256: 34a7791ed525d767ec58be5c69fa7833bc3a89de14137267acfc502b5c477da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage. This pattern is indicative of a phishing or malware distribution campaign, where the PDF serves as a lure to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://optimaglobal.net/ckupload/files/57522967869.pdf In PDF document text
    • http://sns.hu/_user/file/4475478617.pdfIn PDF document text
    • http://adveotec.com/img/file/menefa.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/812cbe3eafbe76f6e926a7678cab5703/29746953677.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a6060695---17851808040.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2885846a7---27194247994.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bcc5f5020be9b7a81e652b236102a20/rurisexixomu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4c7e61cb6f1d71aad4fbf8f3651523ff/35420472345.pdfIn PDF document text
    • https://netlandschool.cl/files/rajuboxumemewavan.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/16739597366.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/ziparidoviwaki.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/i7k86079fp9p0841955gnq2i9c/11085314091.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/51468371659.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jefitema.pdfIn PDF document text
    • https://oferta.lt/i/File/rudufadevidaxut.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0995b97e46---33099244592.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/1872171994.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612e7e5f1f95d.pdfIn PDF document text
    • https://hoavily.com/uploads/files/xakorupob.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/sixusuvunasare.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/fanes.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/93798004366.pdfIn PDF document text
    • https://linardi.ru/files/file/35384704987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=%C3%BCcretsiz+pdf+d%C3%B6n%C3%BC%C5%9Ft%C3%BCr%C3%BCc%C3%BC+program+indirPDF link annotation
    • 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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 19140 bytes
SHA-256: 8a6ae97a1794cb1a9c85d2f6ccd780e6a4fe37707ee11ddac51ba17d9700d49d
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 11728 bytes
SHA-256: c7e7f8eee0107524383deca4c62df57aefb664e582d17bdb7af62393bcaf31ac
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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