Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56c6554b6aedb8a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 15:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3e8dfd203ea3f57ef6a29eaedcb3416 SHA-1: 0dd42b9d7aa753805eb592308ea9debd6d1efe9c SHA-256: c56c6554b6aedb8aa6ee8fff10e01828ec5270f4519e6b677493e706bcf5d313
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. These links are likely intended to redirect users to download malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=gta+vice+city+mobile+game+free+download+apk PDF link annotation
    • https://windsbs.biz/files/file/witazoguwinafokisagido.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/nutaduvi.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-06-29-42-92.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-06/cd81cb977c12bbea3fccb054efe6bea1.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132254843329---78628960680.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/4581980600.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/14648952949.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7de0d570---wazukaposaluj.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t93n1dnpn6r7o98hefl4f30ump/nejaxasagevo.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/tasikadoga.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130920253ea7---81376451499.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/pevot.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/91739931754.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138da3751c1e---vevowomotoveselojizabojom.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nolego.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/44907265188.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/17412548871.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/nenage.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/44741444608.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/76058238941.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/wajisetofuvukaw.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/34571552870.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161354224a261a---rovojibovidafateji.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_off0000bf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8F 17316 bytes
SHA-256: c8d21943cd14741090ee38f2bcf94fe836afe41a032ce2766155eed071a6d3cb
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 11332 bytes
SHA-256: 6baf37cbbcd55993f2f02b788cc6b3d25d2ffebee2d932638883b8e86ca5197c
font_02_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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