Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaa71af71880051…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 16:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2082643822390f81e1d0a35c271e0c4b SHA-1: e162054d0b22f419e306382102856acb2c476c42 SHA-256: aeaa71af718800517fe27bf96e1cd2f70cda2c27b66f03be610ce27e07bc65b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The numerous external links, many pointing to compromised or disposable hosting, suggest an attempt to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript indicates an intent to exploit vulnerabilities or perform actions beyond static document display.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/vuvupopisusivinalevonatis.pdf In PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/97854770319.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/bulavosatowizavurifup.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/6780475734.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb94e2d170---23341881446.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/sojaxamomaf.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9abeaebe---48465323149.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/vefudu.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210925011022.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/61541827326.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/36524619455.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/dubanodedojow.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/55498955577.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/sufikemesapugikizalokenul.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///80978636280.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zupadekiburezisetipo.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/femewafaluken.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/71661103589.pdfIn PDF document text
    • http://tallygroupkwt.com/uploads/file/jafijapeximebiri.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///582699468.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/93084634737.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pijuwidisodu.pdfIn PDF document text
    • http://benrassam.com/uploads/files/43250091254.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/687186806.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/fuberega.pdfIn PDF document text
    • https://mahae.hu/files/files/momakobevarujug.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/fefulefogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+developer+options+animation+speedPDF link annotation
    • 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_off0000b57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 10600 bytes
SHA-256: f8105c44aa5891185f2afefd609d978c97c7afb76efdecdfcc67a359372a2dfb
font_01_sfnt_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 16244 bytes
SHA-256: 53852ed8262e3f72d2de700c9e9c55adc54cabaaeb7241dfa7a874b8aaaaf054
font_02_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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