Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36269e685e58ffb…

MALICIOUS

PDF

70.7 KB Created: 2021-08-27 22:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 264e2d4020feb7975cc2e23e442b9597 SHA-1: 78db289f695422d5d6148a8be1fb75e9b48b5807 SHA-256: b36269e685e58ffbdb5de6cc4daa10f02bee3f1d8a678a94b22e327c405c9508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=hello+in+different+indian+languages PDF link annotation
    • http://cappellastudio.it/userfiles/files/83004894593.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/222911931.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/59726598941.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c683c0acb1e644cc7ac453a5b89b1be1/17673144371.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/47494425010.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/69729d48e5f6a5c1c5a8d8a025905e1f/1850621186.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/drmgjvr5e7oiv51heoc102ma0e/mubikagodumafuparazixil.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/37094137741.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/44441274867.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/3101660509.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/13830061341.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/sogus.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/mofevarujuvulisoladufu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/32364471415.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/80738671522.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072812180673499.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/wobilajisujinoxomuwejo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117acc490850---juzeripo.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/694411635.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c963fdd9e9e---36772453048.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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 16696 bytes
SHA-256: 342b2cbdf0fb7f8325e538c4ddd69409d31cc3b2d3308fae0ad75ad790f0d4e4
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 10620 bytes
SHA-256: 11f2ac74aad640e24d1f2a0f21de9c4a5fa6f69dc7c8a031028e231863097676
font_02_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1