Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f84e144df3eb2d4…

MALICIOUS

PDF

111.3 KB Created: 2021-08-02 06:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2b6b946a81272766d8cd8134c87fdde SHA-1: e2e9d7bc34858a6fcaf3b475a19232825edd4b10 SHA-256: 3f84e144df3eb2d4863e82c859093dcba5274752e179c11c8ce555a068219222
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier scored it with high confidence. It contains numerous links pointing to compromised WordPress upload directories and other domains, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://wanyuantemple.tw/userfiles/file/vuzosewubefapexozizelivi.pdf In PDF document text
    • https://masukpt2.com/contents//files/21727781551.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9f29qh0akuk4uf0408dfqir7di/narideduzamerakixaro.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1b2063b6---basekuxutotewubugifuru.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tjdd6hqdfko91qh7ih13fo51bk/betewubeja.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/jerotuvofujokujamoboguva.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3h1u73iupr5fhpg2baa7qb94c7/8824859006.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160983764c748f---jemurupibago.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/82560999794.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38ad09bd2f---70288319789.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc1aef3593---76112056922.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b5d01f08ac576bd75af2371f40b84865/tadaw.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a97efbe0---bitukafujo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0570850af7f9088c3e014a80b243546b/riwem.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/70473628402.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m66tck5ouincld7mjhn05is631/90087679800.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ab68e734---jupazonasavex.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/51508639473.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd05f01a9---ligedasaz.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e738b3570---jamolapirujo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1d68d0298b69fe8683a7e75561f1a53c/76527688158.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diganajoxojatafutuf.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1c6549775b5cfca39f925c1e39968f7b/wabizegazumusinazekijop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=does+kakashi+love+hanarePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 15856 bytes
SHA-256: eb99419c72063698e6bec1fece106b9283535f8b8073d644d8be9aa57c0d5dd7
font_02_sfnt_off000166dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DC 10268 bytes
SHA-256: b4b2cf63d5c76b15fa7091dc51536b229547bbe5ccf471a8db411f3a6bc1a98a
font_03_sfnt_off00017de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE2 18068 bytes
SHA-256: fff69d9f4574007b7f0147fd04c52d26cac4fbe403d87c55795a18ff38e90432

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