Malicious PDF — malware analysis report

Static analysis result for SHA-256 3582b3ceaddbc784…

MALICIOUS

PDF

66.0 KB Created: 2021-11-08 15:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fba9572d4e0726bc0d5bac8e65b58e5f SHA-1: 27ad6dcfc49d8855ca694a80a930f686ebff6910 SHA-256: 3582b3ceaddbc7847905a5cc9e800720e9de9acd18c9bf8a433efa8e84ca6267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t4jnet5if7btj0qr2ibbvevt2j/togeme.pdf In PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fupup.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/noduvopu.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/61923823093.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210913173602.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/6914874752.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161758c5b638---27996460747.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/56262566622.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d195f3d5---rakifawiwefuzame.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/wekomim.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/42057757247.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/20211025122905802.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/17155724100.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/gemumekesigoxigopajota.pdfIn PDF document text
    • http://sdes.in/uploads/846263788.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/23235297824.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/18112936450.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/47379608800.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/wiketagipo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/33819707679.pdfIn PDF document text
    • http://come2menorca.com/images/file/nupimelopanitos.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/fuwoxamawi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=favor+meaning+in+marathiPDF 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_off00009ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE2 17396 bytes
SHA-256: 7c57827609079dff93e810d80661f2df664d1dce3fac2136c58f6b850f82fe6d
font_01_sfnt_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 10384 bytes
SHA-256: 8cd704cb517147929c23b74493e5262706dde681524a1ff052fa9f5c56909d1b