Malicious PDF — malware analysis report

Static analysis result for SHA-256 17013bed146574b2…

MALICIOUS

PDF

68.8 KB Created: 2021-09-11 23:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 159839ae955cb328e6999c984aeab422 SHA-1: 0397a8d66dfb1cd698ad737d842cb1340f04488e SHA-256: 17013bed146574b2347c1a1215abc5ef0b8f16818076136aea285c4ca508564c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple URLs, some of which point to link farms hosted on potentially compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qk3i567na0rue0qdjmbrsc3f2/tubanitumo.pdf In PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/47093185264.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/balovataxojoximepofipo.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/repovusosobuvezi.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/59833836795.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/4882248963.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d403dbe67---30099472591.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0554f368---jitiguboveripuketuw.pdfIn PDF document text
    • http://ge-mak.com/files/24840865522.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/zibepigesele.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909203730.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/70034381048.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8c7cg6bh4bvcf1vn6qbk7tmuej/99567635417.pdfIn PDF document text
    • http://rsentco.com/upload/file/wuzuxajodesodaka.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/34077136040.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/88522179420.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/ralijosopuwevazelesep.pdfIn PDF document text
    • http://napiarsaigh.com/images/suwizab.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/4838118722.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/fefapurujenuxarug.pdfIn PDF document text
    • http://builderall.info/userfiles/file/11172932812.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/jojeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+emulator+online+downloadPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/8342422651.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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 14360 bytes
SHA-256: d14be414192ba8546a08b5a68d3c571630ca2a1e47063f0c77f743d60c695b10
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 10408 bytes
SHA-256: 3b2d37ef5c0a903c430364158883ee3949bd04d0a448ade8772d253eff2433c0
font_02_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1