Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a770b5a4825ee7…

MALICIOUS

PDF

108.1 KB Created: 2021-08-17 10:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9eab67db5b1c532b3d089566b6c4d45 SHA-1: ae7fa06fededbb3a364f985afce3d5b6a849e480 SHA-256: 83a770b5a4825ee722b5911203371a55b9888059494651a26119fe9d0da155a6
212 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection, strongly indicating a phishing or scam attempt. The presence of embedded JavaScript and numerous external URIs pointing to compromised WordPress sites suggests an attempt to download and execute further malicious content or redirect users to phishing pages. The document's content and structure align with advance-fee scam lures, likely aiming to deceive users into believing they are receiving a parcel or prize.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=postal+service+test+473+study+guide PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9108d548---najedovexisukinolizur.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/mik8k0i34ute9gr060n62p079i/bopabu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088458583974---jarekilada.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9a6eca12d801f91871c7f773c18af3ea/kelamopurobinixagegoreme.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/47737452848.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/fozibomilawefadenege.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/90921347354.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fosegejavofudazuvolevoga.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091324300271---poniz.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/u788s91qoj315nqduhsjepocb2/43350321268.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/tugawaxarobodanavagegeviv.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/34980424224.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/11249531900.pdfIn PDF document text
    • https://vleek.com/uploads/files/zeluvabaramigitasup.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/15325308531.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f8be077a---77145902081.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8005be359906735fa0efa254544946b0/9017815892.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/25472180477.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac1bce94b51d3219e8ae043d9e8a01e6/2270889854.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/feriruvizivezoxekabi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wusamamunaruwa.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/gerorexagodeza.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/jejeb.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_off000142a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 17864 bytes
SHA-256: ebe0194822ed5020381e3252862921e6f0686bf90532af5689738888014ac09e
font_01_sfnt_off000170df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188F6 11024 bytes
SHA-256: d5d01437ac88534836cee799d0153b25379c466c708f2de8797c9240f10b4a6c