Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a8bfc9bb8602b8…

MALICIOUS

PDF

97.6 KB Created: 2021-07-02 17:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baedca235a3748a84bc004b61a65c669 SHA-1: d47f1eb70a05fc4adbd4b38bfee34a15931c6d88 SHA-256: 19a8bfc9bb8602b848cb7fcfa227ae337e8b1b18b0cda87b078fd6b6d096fd9b
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of 'cmdj0/lefezovuwew.pdf' in the document text suggests an attempt to execute commands or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/fmum8oog0ahibu1sk5hnlcmdj0/lefezovuwew.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4ae48d6ba1a8aa0bc843c137193e8081/mibozozoxaz.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/temiwulo.pdfIn macro / runtime command snippet
    • https://webtechnocrats.com/upload/file/sobalepenipoxi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/785e7e6d45abd342e997ff0631cba329/88637244248.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/31990295181.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18442299500.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c04f92fc5da60a1b24a60e74b0d54974/74234491120.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ci6gop9d16gro4u4ndn93c02g5/garafub.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b48ca57184b---90858768749.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/75291101789.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b29c28f10b40c0c5399aaffc606bf4e2/norulatizisuluw.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/72q2bbvh3gomsulkbgv763fr3p/rerudamexe.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ced773f4---rapofemuzizum.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/nediwufebajujat.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/finmg5a1arpr3pfon1titqprt1/wexebupaxazoludaje.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/77169630374.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0f9baef202cae105c2da9db74da04e1d/34573733270.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd7d814b5---xojidozoginizabasap.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/dukob.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8vjtjp7tovt6ledhsm4smi1c5q/tepujoketuvak.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c8d8a87a---69514932998.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/wobipuvoriparigosuwuxo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160792dfa11ed2---97757076520.pdfIn PDF document text
    • http://ciskmv.com/css/file/83794329440.pdfIn PDF document text
    • https://apoc.com.au/wp-content/pluginsIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dialogue+of+comfort+against+tribulationPDF 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_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 19120 bytes
SHA-256: 86841e86d62f02a79152eb6d7d2b5474a270dcadae0f6bdc99817efaa04c5ab4
font_01_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 10920 bytes
SHA-256: f0184bac1693a04883a8f36e02532889a4845e35f0974da44fb90497280d6ba8
font_02_sfnt_off00015f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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