Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56a125f4edd4208…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 01:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c7c9415782bd8ddb44ad35690c835f0 SHA-1: 0c1b567ce078989df1864abeb3a721286718dab7 SHA-256: e56a125f4edd420855f304e92d1c02417e0e7c22816f8b15696c25ad3560b331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful URLs.

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://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fd2da4db78e9079483141478e6ad7587/1750689729.pdf In PDF document text
    • http://imbirimbir.ru/files/sabomunobozob.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef56d4ad0b---rutuvukejapivuledag.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/zamiwowogodizakazoxor.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/mosozebopawijegonuv.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099adb241fe4---dobumik.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/21/82914565858.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/33665856905.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/39769703174.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0730ee46a81836123802cf40739f14c3/lutifigebizumali.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/976b4f7fe2152b5cb3353383348d384b/kukenuzisidi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/85d0mbop02gs1t90tchgg0q2hb/tefanitewut.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/ribibizeredamesopewipinew.pdfIn PDF document text
    • http://inercial.es/uploads/files/jerajinesipowu.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/59894289083.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613681a350b0a---64152325896.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/sijuroxipilutovipa.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f63ec9b1ed0be51672ffc3d49352f411/bedurejofezisasoza.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/tatefe.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/95557052903.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/sebidujojosafiw.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/zorinu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce154568d---53401164712.pdfIn PDF document text
    • http://abwessex.com/uploads/files/petejelagujubumuropibola.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hcqrm6euemkfvs287prspg7e70/gawuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manual+de+bomberos+municipales+departamentales+guatemalaPDF 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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 11088 bytes
SHA-256: f32c824643e2fd30b83abbf92df92e1fdda9854c1a3e9c05a3bae3f5534b00f5
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 20132 bytes
SHA-256: 6b720d242c12269647b897f1086e05e37ce75373e6cd11760a1fe75d73d12f29
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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