Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7038b8531ea2c2b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 17:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eeca9f529e68484df6567df29d8a5626 SHA-1: d88934dd4ed59ece18fef7c23c1d1699363f6078 SHA-256: e7038b8531ea2c2bdc41ac7c6857769c610b2b8f6fb93868531c35bd6530d333
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=indian+truck+games+download PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3c422305f626f4c1f0b76670ac5bb9f9/23605128175.pdfIn PDF document text
    • https://citytrafik.nu/images/file/naxuzo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/92219598430.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/1572728968.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/moxowupuludidigurapozegiz.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/talele.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/75420f2f4264402b217f25d7a3288a3f/begoxexevubojubuvadukovas.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/bumaxugotituxe.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/30351017739.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/19430187895.pdfIn PDF document text
    • https://renetravel.ro/images/files/jonunikerowig.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/zaturenuxipimipetutowapeg.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/32092737586.pdfIn PDF document text
    • https://petek.biz/resimler/files/temuxiwuwabaruka.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/nalejemuzagip.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13511f22b---33345830266.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/15416441893.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ialhqud1qvui5hjv9e83net0o0/12438336375.pdfIn PDF document text
    • http://voijin.com/userfiles/files/zigaju.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/82936544313.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/36146993818.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/tefatajelap.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/89235917390.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910170347.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_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 16812 bytes
SHA-256: 328c7712c181495d677eb57f92b32c981a3953eeb0ec4ca273ef320bc2feae9d
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 10940 bytes
SHA-256: 15998201114555171d4b52f6cbbe7aef55e5cf55923a9451fd9852689c15ec29