Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b9630df8a955eb…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 20:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcf5f6dcbeb9d787d1dcf0c0701a9d1a SHA-1: 6403323301bd6b00f2fe5c2c8affa0b072b71cfc SHA-256: 54b9630df8a955ebabb801cbf5178dc65a546f8038766c9e1f44d2213f4456ae
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • 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.
  • 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=zombie+defense+2+mod+apk PDF link annotation
    • http://pincesorvarshop.hu/editor_up/vitidijemite.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/magepowixoxebumebinokaz.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/depabutumatixipikupawura.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918035111624042.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ec5aa2ecb8d87b46d159f2de6f04a9b0/neragane.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/81340728903.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/bewinuwubazeteduwevuxipe.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/popesefan.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/66458918657.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/70654756337.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dp636jbgbvnmnvrldcapafttke/58593510484.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/xikevixafamurolobutaduw.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/61082558518.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/10928357600.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/64249643055.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/45418291207.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/24804052068.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2527bd7a---marejemizifogox.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/pumobekenakojanifaka.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/padugogatiripox.pdfIn PDF document text
    • http://vpsystem.com/files/fck/17576728439.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/6779469616.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/bududa.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/98178772.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1fjlpft2mapp28aim6j2oluan/73350293692.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/91375923389.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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 10732 bytes
SHA-256: 983a4ad5f50ba3f5b3fa1fe6f6113b66ac15ac2de4b82650d6fc369c2ed5c449
font_01_sfnt_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 17068 bytes
SHA-256: 77a0916985cfac0d5da42dd95be047a675ccae7c9c07786916830ba51e4a70e6
font_02_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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