Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e2400d162605ff…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 03:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a6151ab4603d333b29174f306cf7ebd SHA-1: c20cbb53ebd715b83775166d90ae3514706639de SHA-256: 42e2400d162605ffdd82049e468f2e0839e9e61ab31de33edc656facd752ddb2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs and the heuristic findings strongly indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+do+i+move+my+pictures+to+sd+card PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/55056a8d32f4a25e46fa59d4e5aa0080/jeperasiduvorofe.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/wobirizikinonukerisis.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/jatine.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/funiwuvakum.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/90528229549.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1a0dc3b7d88c632b08754375289d6bf6/44750064888.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/7966720024.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613116e30b614---nugesu.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/felawekupazedib.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/92647778378.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liriwoli.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/eirmituvj5jsuiqj5aophimufg/bonixanalogitebozizegij.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/68262591224.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090223133348.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/sepalexebegafa.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/17805970788.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/repepakupebidikogazorusa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613878c60ed27---rujazu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/misakonodojotixojoxi.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tunofilezabulilidimusu.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/82822247363.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajavolitunipelefikon.pdfIn PDF document text
    • http://dhf-china.com/d/files/niwixejipodotanitivenewa.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/kopabusefapasi.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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 10884 bytes
SHA-256: 6a67038e909176ac45ef274196aff4f8ebf8e8a4c70f3813b3a09b4915236def
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 18604 bytes
SHA-256: 6be23c95a4007bce73d1c366c9eea04dd0fb2d1c5a6bd2848b1a9d3ea3e1d681