Malicious PDF — malware analysis report

Static analysis result for SHA-256 8538c3a5321aa988…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 15:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11c51db31cea9aaf8e1cf20c981cdf60 SHA-1: f2d990b406396aeb28b1740d68339e3e1b9ccf8a SHA-256: 8538c3a5321aa98808e827f163974085e41e52d08190bf534b52e3c724840bec
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The presence of link farms on disposable hosting and compromised CMS uploads points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://drafthe.ru/uplcv?utm_term=does+airpods+pro+noise+cancelling+work+with+android PDF link annotation
    • http://factorycontrolprojects.com/userfiles/file/gawuzozufodaretorenamowip.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/kolabezagemugis.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cb3a4ef810254e5c46efa32f7a0bf358/jopezemikugubutinikutamit.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5459b41cba3d3694915144a7face85f3/77534966801.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210921_746E98BDF4E39120.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zowaleb.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/86900503135.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/67053820404.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091213214473499.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jirajitatiduj.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e066b84e28---toferotilig.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/liguromezo.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-21-10-56-42-n0njZFmj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143835fdfd75---24886716359.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/kerukatelewagixosipametad.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/rakegonofisoposetokutore.pdfIn PDF document text
    • https://revive.fashion/upload/files/tixunivixazebixodanozada.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/javidolukakajujavonibuw.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/44613850738.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/38018303112.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/nedajugofipularofif.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/jujixaxuge.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/91357586366.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bisiw.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_off0000af4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4F 15108 bytes
SHA-256: b0d876532c8b5d9cfc8e92c448dad3952b5fe412c1269205f4b04ff1af408063
font_01_sfnt_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 10972 bytes
SHA-256: d774f737034be44f60edaaf866348d6dbc0c737c12221923b8337dc7cd1e4d56
font_02_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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