Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d881a75d07e47e0…

MALICIOUS

PDF

86.6 KB Created: 2021-09-04 06:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32bc22ddaa0041173be1863849f6948f SHA-1: b610fc119ebe011633a41d0b6943a9f401c96c2b SHA-256: 0d881a75d07e47e09717d03fb22886a2408f4de22b33e306ee18e348f5f4e627
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests these links lead to malicious content hosted on compromised sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://pistant.ru/uplcv?utm_term=dental+infection+antibiotic+guidelines+pdf PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3a2f747247eca1c309abe0ae7bd42618/modenibif.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/5296692123.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6b231b70781e402ec3887b39bfed4c60/95967445511.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c369065d---fuxawidikezuvu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gep4luv8k7cpg4o5el52f1pguv/rativutatibododepoxave.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f61b92850---kuxekugubetibiregototat.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076e06eb28aa---kitipatotamo.pdfIn PDF document text
    • http://vce34.ru/attachments/file/renajon.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34d4fc417e---77179930344.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210708195733_675821011.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5eb8c37362cb4586bdae46b0d717fe1a/damufisigij.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/48594663980.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/koreravevine.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/80m1kamliccu0h8ag1b613hr33/livulevekaxasiz.pdfIn PDF document text
    • http://royalgroup.at/tmp/73339395331.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/74567153554.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/miwonefidedepapa.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zefuguzamajeped.pdfIn PDF document text
    • http://lex.tj/img/file/rufesolatufuju.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kagamowubakusu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9d51aaf4c81de88b0fb002face430a13/8359985860.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/35509608404.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608564189c439---16557780680.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79645d8562---nowedatawavikugis.pdfIn PDF document text
    • https://dcimx.com/files/wakov.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/zuzidabelukekiloj.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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10936 bytes
SHA-256: 73d1166df0e710694f7280874983e733520631f7ed554ec692aa287b02500693
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 18388 bytes
SHA-256: bb504396f375c48297d6aa9a284b51521ef3a16779ddbc9ae1fbde4159c61df5
font_02_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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