Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b78000a3358fb15…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 12:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3ad833e5dc50bf02df5bfd859ff04c4 SHA-1: 9530e34a9d2b79db4f8326703221f9c62c4aa828 SHA-256: 6b78000a3358fb15bdafe57cef457f06f20e8081ef2a56ac965d910452d34c24
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jeykrishnaclub.com/images/file/lukekiwoxawivob.pdf In PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/jatibotozivuperij.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/netikapumokixadatages.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/lobesulidekakokovibutoj.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/59133175022.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6u6rk2nhruqsn8plavn2jjhul9/xodepexifo.pdfIn PDF document text
    • https://cncunse.com/d/files/fekorujosoni.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/87967850774.pdfIn PDF document text
    • http://potlista.com/file/files/68097955156.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/lefofewoperimizuvulosod.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/zotowememasevuxotawet.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-12/20210912110435594742.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/tubovomutav.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/pumetubijanaku.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jeduxurisup.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c15a7ff5---lapojuzuxoli.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/mirajubijagi.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/82941573582.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/wizujeliwokukutorujub.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2216b4c1---lafikatomajapijig.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/207c7ada0c254ee8b032de9dc540cae3/setibawazilitidolu.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/72606546053.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/zolavunududewelik.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/44997989538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=canon+print+drivers+for+androidPDF 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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 10540 bytes
SHA-256: 780c7c9675612c12fa345b822c287c6a8128493c42f271778d2d3a82e384ebc1
font_01_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 15184 bytes
SHA-256: 776ce22ba05954e0f7f71ff9464263e95daaf19b0a1833e047b6acc0b7c99240
font_02_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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