Malicious PDF — malware analysis report

Static analysis result for SHA-256 05338e809df449cd…

MALICIOUS

PDF

93.3 KB Created: 2021-09-18 04:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3341464ce533ab70a3e98cd60e0867f SHA-1: f54f7493de45facb39c57df5947e16cbf9e35b5e SHA-256: 05338e809df449cd6b9900012100e606ccf25940e385c26a352a61a4f7615776
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=true+id+caller+name+address+location+tracker PDF link annotation
    • http://www.enredmail.com/templates/files/idCliente_/file/tokugemazabubatikinima.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/463975920.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/96912041632.pdfIn PDF document text
    • http://ahknchem.com/upload/files/zorasit.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/25644351924.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/44171907033.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/71075882437.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/76413826227.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5aa543dc---68995998974.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/61009633491.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/pizadekarigimodatifom.pdfIn PDF document text
    • https://alohasafaris.com/files/zetoxukasaz.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f9cd9cea981ccc66c96acc2dc39e1334/17950293758.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rpmembkhi5t53poo4d55ra7ig7/demavexefijusasa.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/xejewavegonanuweba.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/vulosotas.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/12546334782.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/52785803528.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/47407070913.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7bccf1e0---vesonofujabozuruk.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/kemuma.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/92597207707.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908004944.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_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 10684 bytes
SHA-256: f7e6958d23c96f8ed0165f8a025153fd4e879b6ec972cff0bc79553271d66fb1
font_02_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 16972 bytes
SHA-256: 4cea1c3d468e6f95ce4aec16a290df356d65a0fcec606639a1b20a3cc0e8b5dd

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