Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2573441541b0c3…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 01:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a823e3e6a46169f655732b08f2873429 SHA-1: cd1686cb652d56c55ccf057fca1588aebdc87bd6 SHA-256: 3b2573441541b0c3b76115ccd3be495f130a16b05d091616e329d8ef073ea9a8
156 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 a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://gfb.it/upload/fck/file/xulelabikunexezi.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb81e869fa---xozavejigumezo.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/01246ab5d6a2bb9e88339fe205393a43/64795287361.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/nerobanak.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/zebusoronejozori.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0d97ec2416d11b656c9ac04d833a114f/85645938293.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/35606210843.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/tesozubarezabikudexusuli.pdfIn PDF document text
    • http://idcla.net/upload/files/xenejuwelitetavudi.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/68465034470.pdfIn PDF document text
    • http://klpa.net/userData/board/file/vegazer.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/63268085920.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/53695046510.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/potoxufurelafuj.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/34945906503.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc1c5dac6---32358885986.pdfIn PDF document text
    • https://el-tall.pl/pics/file/xesavagetalapipij.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090903083773499.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/nubekaguxafilizudun.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/5190341807.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/88395963565.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/pexorinunukidevukawotuval.pdfIn PDF document text
    • http://turatabor.hu/media/kunonodozewofirijupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cid+tamil+new+episodePDF 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_off0000be72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 10568 bytes
SHA-256: 24534c30642e154dd120a1b7183373085901cfb45725f857ca2344a6dbe9f13a
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 17204 bytes
SHA-256: 7c5e3c1b1f8508ac947e056e183f0056830cc9f706def4303e13c20c3d77ffaf
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1